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and 11.4.1 Preparation of Alcohols
Alcohols are prepared by the following methods:
1. From alkenes
(i) By acid catalysed hydration: Alkenes react with water in the presence of acid as catalyst to form alcohols. In case of unsymmetrical alkenes, the addition reaction takes place in accordance with Markovnikov's rule (Unit 13, Class XI).
Mechanism
The mechanism of the reaction involves the following three steps:
Step 1: Protonation of alkene to form carbocation by electrophilic attack of .
Step 2: Nucleophilic attack of water on carbocation.
C[C+](C)C(C)C C#CC(C)C(C)(C)[OH2+]
Step 3: Deprotonation to form an alcohol.
329 Alcohols, Phenols and Ether
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Question Text | and 11.4.1 Preparation of Alcohols
Alcohols are prepared by the following methods:
1. From alkenes
(i) By acid catalysed hydration: Alkenes react with water in the presence of acid as catalyst to form alcohols. In case of unsymmetrical alkenes, the addition reaction takes place in accordance with Markovnikov's rule (Unit 13, Class XI).
Mechanism
The mechanism of the reaction involves the following three steps:
Step 1: Protonation of alkene to form carbocation by electrophilic attack of .
Step 2: Nucleophilic attack of water on carbocation.
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Updated On | May 28, 2023 |
Topic | Alcohols, Phenols & Ethers |
Subject | Chemistry |
Class | Class 11 |
Answer Type | Video solution: 1 |
Upvotes | 123 |
Avg. Video Duration | 5 min |