Class 12 Chemistry Chapter 7 Alcohols Phenols and Ethers ncert solutions

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Alcohols Phenols and Ethers Class 12 ncert solutions: Chemistry Class 12 Chapter 7 exercise solutions

TextbookNCERT
ClassClass 12
SubjectChemistry
ChapterChapter 7
Chapter NameAlcohols Phenols and Ethers ncert solutions
CategoryNcert Solutions
MediumEnglish

Are you looking for Class 12 Chemistry Chapter 7 Alcohols Phenols and Ethers ncert solutions? Now you can download Ncert Chemistry Class 12 Chapter 7 exercise solutions pdf from here.

Question 7.1: Write IUPAC names of the following compounds:

(i) 

NCERT Solutions for Class 12 Chemistry Chapter 2 - Alcohols, Phenols And Ethers

(ii) 

NCERT Solutions for Class 12 Chemistry Chapter 2 - Alcohols, Phenols And Ethers

(iii) 

NCERT Solutions for Class 12 Chemistry Chapter 2 - Alcohols, Phenols And Ethers

(iv) 

NCERT Solutions for Class 12 Chemistry Chapter 2 - Alcohols, Phenols And Ethers

(v) 

NCERT Solutions for Class 12 Chemistry Chapter 2 - Alcohols, Phenols And Ethers

(vi) 

NCERT Solutions for Class 12 Chemistry Chapter 2 - Alcohols, Phenols And Ethers

(vii) 

NCERT Solutions for Class 12 Chemistry Chapter 2 - Alcohols, Phenols And Ethers

(viii) 

NCERT Solutions for Class 12 Chemistry Chapter 2 - Alcohols, Phenols And Ethers

(ix) 

NCERT Solutions for Class 12 Chemistry Chapter 2 - Alcohols, Phenols And Ethers

(x)

(xi)

(xii) 

NCERT Solutions for Class 12 Chemistry Chapter 2 - Alcohols, Phenols And Ethers

Solution 7.1:

(i) 2, 2, 4-Trimethylpentan-3-ol

(ii) 5-Ethylheptane-2, 4-diol

(iii) Butane-2, 3-diol

(iv) Propane-1, 2, 3-triol

(v) 2-Methylphenol

(vi) 4-Methylphenol

(vii) 2, 5-Dimethylphenol

(viii) 2, 6-Dimethylphenol

(ix) 1-Methoxy-2-methylpropane

(x) Ethoxybenzene

(xi) 1-Phenoxyheptane

(xii) 2-Ethoxybutane

Question 7.2: Write structures of the compounds whose IUPAC names are as follows:

  • (i) 2 – Methylbutan – 2 – ol
  • (ii) 1 – Phenylpropan – 2 – ol
  • (iii) 3 , 5 – Dimethylhexane – 1 , 3 , 5 – triol
  • (iv) 2, 3 – Diethylphenol
  • (v) 1 – Ethoxypropane
  • (vi) 2 – Ethoxy – 3 – methylpentane
  • (vii) Cyclohexylmethanol
  • (viii) 3 – Cyclohexylpentan – 3 – ol
  • (ix) Cyclopent – 3 – en – 1 – ol
  • (x) 4-Chloro-3-ethylbutan-1-ol.

Solution 7.2:

NCERT Solutions for Class 12 Chemistry Chapter 11 Alcohols, Phenols and Ethers Q 11.2-1
NCERT Solutions for Class 12 Chemistry Chapter 11 Alcohols, Phenols and Ethers Q 11.2-2

Question 7.3: (a) Draw the structures of all isomeric alcohols of molecular formula C5H12O and give their IUPAC names.
(b) Classify the isomers of alcohols in question.

Solution 7.3: (i) The structures & IUPAC names of all isomeric alcohols with a molecular formula of C5H12O are shown below:

(a) CH3-CH2-CH2-CH2-CH2-OH

Pentan – 1 – ol (1 °)

NCERT Solutions for Class 12 Chemistry Chapter 11 Alcohols, Phenols and Ethers Q 11.3

2 – Methylbutan – 2 – ol ( 3 ° )

(b) Primary alcohol: Pentan – 1 – ol ; 2 – Methylbutan – 1 – ol ;

3 – Methylbutan – 1 – ol ; 2, 2 – Dimethylpropan – 1 – ol

Secondary alcohol: Pentan – 2 – ol ; 3 – Methylbutan – 2 – ol ;

Pentan – 3 – ol

Tertiary alcohol: 2 – methylbutan – 2 – ol

Question 7.4: Explain why propanol has higher boiling point than that of the hydrocarbon, butane?

Solution 7.4: The presence of – OH group makes Propanol undergo intermolecular H-bonding. Butane, while on the other side does not have the same privilege

NCERT Solutions for Class 12 Chemistry Chapter 11 Alcohols, Phenols and Ethers Q 11.4

Hence, additional energy would be required to break the intermolecular hydrogen bonds.

This is the reason why hydrocarbon butane has a lower boiling point than propanol.

Question 7.5: Alcohols are comparatively more soluble in water than hydrocarbons of comparable molecular masses. Explain this fact.

Solution 7.5: Due to the presence of – OH group, alcohols form H – bonds with water.

NCERT Solutions for Class 12 Chemistry Chapter 11 Alcohols, Phenols and Ethers Q 11.5As a result, alcohols are comparatively more soluble in water than hydrocarbons of comparable molecular masses.

Question 7.6: What is meant by hydroboration-oxidation reaction? Illustrate it with an example.

Solution 7.6: The hydroboration – oxidation reaction is the reaction where borane is added in order for the oxidation to take place. For example, propan – 1 – ol is formed by making propene undergo the hydroboration – oxidation reaction. In the above reaction, the reaction between propene and diborane ( BH 3 )2 takes place in order to form trialkyl borane which acts an additional product. This additional product is oxidized to alcohol by hydrogen peroxide in the presence of aqueous sodium hydroxide.

NCERT Solutions for Class 12 Chemistry Chapter 11 Alcohols, Phenols and Ethers Q 11.6

Question 7.7: Give the structures and IUPAC names of monohydric phenols of molecular formula, C7H8O.

Solution 7.7:

Question 7.8: While separating a mixture of ortho and para nitrophenols by steam distillation, name the isomer which will be steam volatile. Give reason.

Solution 7.8: Intramolecular H-bonding is present in o-nitrophenol. In p-nitrophenol, the molecules are strongly associated due to the presence of intermolecular bonding. Hence, o-nitrophenol is steam volatile.

NCERT Solutions for Class 12 Chemistry Chapter 2 - Alcohols, Phenols And Ethers

Question 7.9: Give the equations of reactions for the preparation of phenol from cumene.

Solution 7.9: To prepare phenol, cumene is first oxidized in the presence of air of cumene hydro-peroxide.

NCERT Solutions for Class 12 Chemistry Chapter 2 - Alcohols, Phenols And Ethers

Then, cumene hydroxide is treated with dilute acid to prepare phenol and acetone as by-products.

NCERT Solutions for Class 12 Chemistry Chapter 2 - Alcohols, Phenols And Ethers

Question 7.10: Write chemical reaction for the preparation of phenol from chlorobenzene.

Solution 7.10: Chlorobenzene is fused with NaOH (at 623 K and 320 atm pressure) to produce sodium phenoxide, which gives phenol on acidification.

NCERT Solutions for Class 12 Chemistry Chapter 2 - Alcohols, Phenols And Ethers

Question 7.11: Write the mechanism of hydration of ethene to yield ethanol.

Solution 7.11: The mechanism of hydration of ethene to form ethanol involves three steps.

Step 1:

Protonation of ethene to form carbocation by electrophilic attack of H3O+:

NCERT Solutions for Class 12 Chemistry Chapter 2 - Alcohols, Phenols And Ethers

Step 2:

Nucleophilic attack of water on carbocation:

NCERT Solutions for Class 12 Chemistry Chapter 2 - Alcohols, Phenols And Ethers

Step 3:

Deprotonation to form ethanol:

NCERT Solutions for Class 12 Chemistry Chapter 2 - Alcohols, Phenols And Ethers

Question 7.12: You are given benzene, conc. H2SO4 and NaOH. Write the equations for the preparation of phenol using these reagents.

Solution 7.12:

NCERT Solutions for Class 12 Chemistry Chapter 2 - Alcohols, Phenols And Ethers

Question 7.13: Show how will you synthesise:
(i) 1-phenylethanol from a suitable alkene.
(ii) cyclohexylmethanol using an alkyl halide by an SN2 reaction.
(iii) pentan-1-ol using a suitable alkyl halide?

Solution 7.13: (i) By acid-catalyzed hydration of ethylbenzene (styrene), 1-phenylethanol can be synthesized.

NCERT Solutions for Class 12 Chemistry Chapter 2 - Alcohols, Phenols And Ethers

(ii) When chloromethylcyclohexane is treated with sodium hydroxide, cyclohexylmethanol is obtained.

NCERT Solutions for Class 12 Chemistry Chapter 2 - Alcohols, Phenols And Ethers

(iii) When 1-chloropentane is treated with NaOH, pentan-1-ol is produced.

NCERT Solutions for Class 12 Chemistry Chapter 2 - Alcohols, Phenols And Ethers

Question 7.14: Give two reactions that show the acidic nature of phenol. Compare acidity of phenol with that of ethanol.

Solution 7.14: The acidic nature of phenol can be represented by the following two reactions:

(i) Phenol reacts with sodium to give sodium phenoxide, liberating H2.

NCERT Solutions for Class 12 Chemistry Chapter 2 - Alcohols, Phenols And Ethers

(ii) Phenol reacts with sodium hydroxide to give sodium phenoxide and water as by-products.

NCERT Solutions for Class 12 Chemistry Chapter 2 - Alcohols, Phenols And Ethers

The acidity of phenol is more than that of ethanol. This is because after losing a proton, the phenoxide ion undergoes resonance and gets stabilized whereas ethoxide ion does not.

NCERT Solutions for Class 12 Chemistry Chapter 2 - Alcohols, Phenols And Ethers

Question 7.15: Explain why is ortho nitrophenol more acidic than ortho methoxyphenol?

Solution 7.15:

NCERT Solutions for Class 12 Chemistry Chapter 2 - Alcohols, Phenols And Ethers

The nitro-group is an electron-withdrawing group. The presence of this group in the ortho position decreases the electron density in the O−H bond. As a result, it is easier to lose a proton. Also, the o-nitrophenoxide ion formed after the loss of protons is stabilized by resonance. Hence, ortho nitrophenol is a stronger acid.

On the other hand, methoxy group is an electron-releasing group. Thus, it increases the electron density in the O−H bond and hence, the proton cannot be given out easily.

For this reason, ortho-nitrophenol is more acidic than ortho-methoxyphenol.

Question 7.16: Explain how does the –OH group attached to a carbon of benzene ring activate it towards electrophilic substitution?

Solution 7.16: The −OH group is an electron-donating group. Thus, it increases the electron density in the benzene ring as shown in the given resonance structure of phenol.

NCERT Solutions for Class 12 Chemistry Chapter 2 - Alcohols, Phenols And Ethers

As a result, the benzene ring is activated towards electrophilic substitution.

Question 7.17: Give equations of the following reactions:
(i) Oxidation of propan-1-ol with alkaline KMnO4 solution.
(ii) Bromine in CS2 with phenol.
(iii) Dilute HNO3 with phenol.
(iv) Treating phenol with chloroform in the presence of aqueous NaOH.

Solution 7.17: (i)NCERT Solutions for Class 12 Chemistry Chapter 2 - Alcohols, Phenols And Ethers

(ii)

NCERT Solutions for Class 12 Chemistry Chapter 2 - Alcohols, Phenols And Ethers

(iii)

NCERT Solutions for Class 12 Chemistry Chapter 2 - Alcohols, Phenols And Ethers

(iv)

NCERT Solutions for Class 12 Chemistry Chapter 2 - Alcohols, Phenols And Ethers

Question 7.18: Explain the following with an example.
(i) Kolbe’s reaction.
(ii) Reimer-Tiemann reaction.
(iii) Williamson ether synthesis.
(iv) Unsymmetrical ether.

Solution 7.18: (i) Kolbe’s reaction:

When phenol is treated with sodium hydroxide, sodium phenoxide is produced. This sodium phenoxide when treated with carbon dioxide, followed by acidification, undergoes electrophilic substitution to give ortho-hydroxybenzoic acid as the main product. This reaction is known as Kolbe’s reaction.

NCERT Solutions for Class 12 Chemistry Chapter 2 - Alcohols, Phenols And Ethers

(ii) Reimer-Tiemann reaction:

When phenol is treated with chloroform (CHCl3) in the presence of sodium hydroxide, a −CHO group is introduced at the ortho position of the benzene ring.

NCERT Solutions for Class 12 Chemistry Chapter 2 - Alcohols, Phenols And Ethers

This reaction is known as the Reimer-Tiemann reaction.

The intermediate is hydrolyzed in the presence of alkalis to produce salicyclaldehyde.

NCERT Solutions for Class 12 Chemistry Chapter 2 - Alcohols, Phenols And Ethers

(iii) Williamson ether synthesis:

Williamson ether synthesis is a laboratory method to prepare symmetrical and unsymmetrical ethers by allowing alkyl halides to react with sodium alkoxides.

NCERT Solutions for Class 12 Chemistry Chapter 2 - Alcohols, Phenols And Ethers

This reaction involves SN2 attack of the alkoxide ion on the alkyl halide. Better results are obtained in case of primary alkyl halides.

NCERT Solutions for Class 12 Chemistry Chapter 2 - Alcohols, Phenols And Ethers

If the alkyl halide is secondary or tertiary, then elimination competes over substitution.

(iv) Unsymmetrical ether: 

An unsymmetrical ether is an ether where two groups on the two sides of an oxygen atom differ (i.e., have an unequal number of carbon atoms). For example: ethyl methyl ether ( CH 3 – O − CH 2 CH 3 ).

Question 7.19: Write the mechanism of acid dehydration of ethanol to yield ethene.

Solution 7.19: The mechanism of acid dehydration of ethanol to yield ethene involves the following three steps:

Step 1: Protonation of ethanol to form ethyl oxonium ion:

NCERT Solutions for Class 12 Chemistry Chapter 2 - Alcohols, Phenols And Ethers

Step 2: Formation of carbocation (rate determining step):

NCERT Solutions for Class 12 Chemistry Chapter 2 - Alcohols, Phenols And Ethers

Step 3: Elimination of a proton to form ethene:

NCERT Solutions for Class 12 Chemistry Chapter 2 - Alcohols, Phenols And Ethers

The acid consumed in step 1 is released in Step 3. After the formation of ethene, it is removed to shift the equilibrium in a forward direction.

Question 7.20: How are the following conversions carried out?
(i) Propene → Propan-2-ol.
(ii) Benzyl chloride → Benzyl alcohol.
(iii) Ethyl magnesium chloride → Propan-1-ol.
(iv) Methyl magnesium bromide → 2-Methylpropan-2-ol.

Solution 7.20: (i) If propene is allowed to react with water in the presence of an acid as a catalyst, then propan-2-ol is obtained.

NCERT Solutions for Class 12 Chemistry Chapter 2 - Alcohols, Phenols And Ethers

(ii) If benzyl chloride is treated with NaOH (followed by acidification) then benzyl alcohol is produced.

NCERT Solutions for Class 12 Chemistry Chapter 2 - Alcohols, Phenols And Ethers

(iii) When ethyl magnesium chloride is treated with methanal, an adduct is the produced which gives propan-1-ol on hydrolysis.

NCERT Solutions for Class 12 Chemistry Chapter 2 - Alcohols, Phenols And Ethers

(iv) When methyl magnesium bromide is treated with propane, an adduct is the product which gives 2-methylpropane-2-ol on hydrolysis.

NCERT Solutions for Class 12 Chemistry Chapter 2 - Alcohols, Phenols And Ethers

Question 7.21: Name the reagents used in the following reactions:
(i) Oxidation of primary alcohol to a carboxylic acid.
(ii) Oxidation of primary alcohol to aldehyde.
(iii) Bromination of phenol to 2,4,6-tribromophenol.
(iv) Benzyl alcohol to benzoic acid.
(v) Dehydration of propan-2-ol to propene.
(vi) Butan-2-one to butan-2-ol.

Solution 7.21:

(i) Oxidation of primary alcohol to a carboxylic acid:

  • Reagent: Potassium permanganate (KMnO₄) or Chromic acid (H₂CrO₄) or Jones reagent (Chromium trioxide in sulfuric acid, CrO₃/H₂SO₄).

(ii) Oxidation of primary alcohol to aldehyde:

  • Reagent: Pyridinium chlorochromate (PCC) or Dess-Martin periodinane or Collins reagent (CrO₃·2Py complex).

(iii) Bromination of phenol to 2,4,6-tribromophenol:

  • Reagent: Bromine water (Br₂ in H₂O).

(iv) Benzyl alcohol to benzoic acid:

  • Reagent: Potassium permanganate (KMnO₄) in alkaline or acidic medium.

(v) Dehydration of propan-2-ol to propene:

  • Reagent: Concentrated sulfuric acid (H₂SO₄) or Aluminum oxide (Al₂O₃) at high temperature.

(vi) Butan-2-one to butan-2-ol:

  • Reagent: Sodium borohydride (NaBH₄) or Lithium aluminum hydride (LiAlH₄).

Question 7.22: Give reason for the higher boiling point of ethanol in comparison to methoxymethane.

Solution 7.22: Ethanol undergoes intermolecular H-bonding due to the presence of −OH group, resulting in the association of molecules. Extra energy is required to break these hydrogen bonds. On the other hand, methoxymethane does not undergo H-bonding. Hence, the boiling point of ethanol is higher than that of methoxymethane.

NCERT Solutions for Class 12 Chemistry

Question 7.23: Give IUPAC names of the following ethers:

(i)

NCERT Solutions for Class 12 Chemistry

(ii)

NCERT Solutions for Class 12 Chemistry

(iii)

NCERT Solutions for Class 12 Chemistry

(iv)

NCERT Solutions for Class 12 Chemistry

(v)

NCERT Solutions for Class 12 Chemistry

(vi)

NCERT Solutions for Class 12 Chemistry

Solution 7.23:

  • (i) 1-Ethoxy-2-methylpropane
  • (ii) 2-Chloro-1-methoxyethane
  • (iii) 4-Nitroanisole
  • (iv) 1-Methoxypropane
  • (v) 1-Ethoxy-4, 4-dimethylcyclohexane
  • (vi) Ethoxybenzene

Question 7.24: Write the names of reagents and equations for the preparation of the following
ethers by Williamson’s synthesis:
(i) 1-Propoxypropane (ii) Ethoxybenzene
(iii) 2-Methoxy-2-methylpropane (iv) 1-Methoxyethane

Solution 7.24: (i)

NCERT Solutions for Class 12 Chemistry

(ii)

NCERT Solutions for Class 12 Chemistry

(iii)

NCERT Solutions for Class 12 Chemistry

(iv)

NCERT Solutions for Class 12 Chemistry

Question 7.25: Illustrate with examples the limitations of Williamson synthesis for the preparation of certain types of ethers.

Solution 7.25: The reaction of Williamson synthesis involves SN2 attack of an alkoxide ion on a primary alkyl halide.

NCERT Solutions for Class 12 Chemistry

But if secondary or tertiary alkyl halides are taken in place of primary alkyl halides, then elimination would compete over substitution. As a result, alkenes would be produced. This is because alkoxides are nucleophiles as well as strong bases. Hence, they react with alkyl halides, which results in an elimination reaction.

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Question 7.26: How is 1-propoxypropane synthesised from propan-1-ol? Write mechanism of this reaction.

Solution 7.26: 1-propoxypropane can be synthesized from propan-1-ol by dehydration.

Propan-1-ol undergoes dehydration in the presence of protic acids (such as H2SO4, H3PO4) to give 1-propoxypropane.

NCERT Solutions for Class 12 Chemistry

The mechanism of this reaction involves the following three steps:

Step 1: Protonation

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Step 2: Nucleophilic attack

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Step 3: Deprotonation

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Question 7.27: Preparation of ethers by acid dehydration of secondary or tertiary alcohols is not a suitable method. Give reason.

Solution 7.27: The synthesis of ethers with dehydration of alcohol is a bimolecular reaction (SN 2) which involves the attack of an alcohol molecule on a protonated alcohol molecule. In the method, the alkyl group should be unhindered. In the case of secondary or tertiary alcohols, the alkyl group is hindered. As a result, elimination of dominates substitution. Hence, in place of ethers, alkenes are formed.

Question 7.28: Write the equation of the reaction of hydrogen iodide with:
(i) 1-propoxypropane (ii) methoxybenzene and (iii) benzyl ethyl ether

Solution 7.28: (i)

NCERT Solutions for Class 12 Chemistry

(ii)

NCERT Solutions for Class 12 Chemistry

(iii)

NCERT Solutions for Class 12 Chemistry

Question 7.29: Explain the fact that in aryl alkyl ethers (i) the alkoxy group activates the benzene ring towards electrophilic substitution  (ii) it directs the incoming substituents to ortho and para positions in the benzene ring

Solution 7.29: (i)

NCERT Solutions for Class 12 Chemistry

In aryl alkyl ethers, due to the +R effect of the alkoxy group, the electron density in the benzene ring increases as shown in the following resonance structure.

NCERT Solutions for Class 12 Chemistry

Thus, benzene is activated towards electrophilic substitution by the alkoxy group.

(ii) It can also be observed from the resonance structures that the electron density increases more at the ortho and para positions than at the meta position. As a result, the incoming substituents are directed to the ortho and para positions in the benzene ring.

Question 7.30: Write the mechanism of the reaction of HI with methoxymethane.

Solution 7.30: The mechanism of the reaction of HI with methoxymethane involves the following steps:

Step1: Protonation of methoxymethane:

NCERT Solutions for Class 12 Chemistry

Step2: Nucleophilic attack of I−:

NCERT Solutions for Class 12 Chemistry

Step3:

When HI is in excess and the reaction is carried out at a high temperature, the methanol formed in the second step reacts with another HI molecule and gets converted to methyl iodide

NCERT Solutions for Class 12 Chemistry

Question 7.31: Write equations of the following reactions:
(i) Friedel-Crafts reaction – alkylation of anisole.
(ii) Nitration of anisole.
(iii) Bromination of anisole in ethanoic acid medium.
(iv) Friedel-Craft’s acetylation of anisole.

Solution 7.31: (i)

NCERT Solutions for Class 12 Chemistry

(ii)

NCERT Solutions for Class 12 Chemistry

(iii)

NCERT Solutions for Class 12 Chemistry

(iv)

NCERT Solutions for Class 12 Chemistry

Question 7.32: Show how would you synthesise the following alcohols from appropriate alkenes?

(i) 

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(ii) 

NCERT Solutions for Class 12 Chemistry

(iii) 

NCERT Solutions for Class 12 Chemistry

(iv) 

NCERT Solutions for Class 12 Chemistry

Solution 7.32: The given alcohols can be synthesized by applying Markovnikov’s rule of acid-catalyzed hydration of appropriate alkenes.

(i)

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(ii)

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(iii)

NCERT Solutions for Class 12 Chemistry

Acid-catalyzed hydration of pent-2-ene also produces pentan-2-ol but along with pentan-3-ol.

NCERT Solutions for Class 12 Chemistry

Thus, the first reaction is preferred over the second one to get pentan-2-ol.

(iv)

NCERT Solutions for Class 12 Chemistry

Question 7.33: When 3-methylbutan-2-ol is treated with HBr, the following reaction takes place:

NCERT Solutions for Class 12 Chemistry
  • Give a mechanism for this reaction.
  • (Hint : The secondary carbocation formed in step II rearranges to a more
  • stable tertiary carbocation by a hydride ion shift from 3rd carbon atom.

Solution 7.33: The mechanism of the given reaction involves the following steps:

Step 1: Protonation

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Step 2: Formation of 2° carbocation by the elimination of a water molecule

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Step 3: Re-arrangement by the hydride-ion shift

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Step 4: Nucleophilic attack

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