Chemistry Class 12 NCERT Solutions: Chapter 11 Alcohols Phenols and Ethers Part 10

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Q: 30. Write the mechanism of the reaction of with methoxymethane.

Answer

The mechanism of the reaction of with methoxymethane involves the following steps:

Step1: Protonation of methoxymethane:

Q 30 1 Protonation of Methoxymethane

Q 30 1 Protonation of Methoxymethane

Q 30 1 Protonation of Methoxymethane

Step2: Nucleophilic attack of :

Q 30 2 Nucleopphilic attack of l-

Q 30 2 Nucleopphilic Attack of L-

Q 30 2 Nucleopphilic attack of l-

Step3:

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

Q 30 3 The Reaction is Carried out at a High Temperature

Q 30 3 the Reaction Is Carried Out at a High Temperature

Q 30 3 The Reaction is Carried out at a High Temperature

Q: 31. Give equations with structures for the reactions given below:

(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.

Answer:

(i)

Q 31 i The Reaction is Carried out at a High Temperature

Q 31 I the Reaction Is Carried Out at a High Temperature

Q 31 i The Reaction is Carried out at a High Temperature

(ii)

Q 31 ii Anisole 2-Nitroanisole and 4-Nitroanisole

Q 31 Ii Anisole 2-Nitroanisole and 4-Nitroanisole

Q 31 ii Anisole 2-Nitroanisole and 4-Nitroanisole

(iii)

Q 31 iii Anisole p-Bbromoanisole and o-Bbromoanisole

Q 31 Iii Anisole P-Bbromoanisole and O-Bbromoanisole

Q 31 iii Anisole p-Bbromoanisole and o-Bbromoanisole

(iv)

Q 31 iv AnisoleEthanoyl chloride

Q 31 Iv AnisoleEthanoyl Chloride

Q 31 iv AnisoleEthanoyl chloride