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Chemistry Part-II

Alcohols, Phenols and Ethers

Explain the following with an example. (i) Kolbes reaction. (i

Chemistry Part-II

Class 12

NCERT

Chapter 1: Haloalkanes and Haloarenes

33 questions

Chapter 2: Alcohols, Phenols and Ethers

38 questions

Give equations of the following reactions:
(i) Oxidation of propan-1-ol with alkaline

K M n O_{4}

solution.
(ii) Bromine in

C S_{2}

with phenol.
(iii) Dilute

H N O_{3}

with phenol.
(iv) Treating phenol wih chloroform in presence of aqueous

N a O H

Explain the following with an example.
(i) Kolbes reaction.
(ii) Reimer-Tiemann reaction.
(iii) Williamson ether synthesis.
(iv) Unsymmetrical ether.

Write the mechanism of acid dehydration of ethanol to yield ethene.

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Chapter 3: Aldehydes, Ketones and Carboxylic Acids

26 questions

Chapter 4: Amines

18 questions

Chapter 5: Biomolecules

25 questions

Chapter 6: Polymers

21 questions

Chapter 7: Chemistry in Everyday Life

27 questions

Question

Hard

Solving time: 1 mins

Explain the following with an example.
(i) Kolbes reaction.
(ii) Reimer-Tiemann reaction.
(iii) Williamson ether synthesis.
(iv) Unsymmetrical ether.

Views: 5,631 students

Updated on: Feb 20, 2024

Book:

Chemistry Part-II (NCERT)

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Eleanor Discussed

Explain the following with an example.
(i) Kolbes reaction.
(ii) Reimer-Tiemann reaction.
(iii) Williamson ether synthesis.
(iv) Unsymmetrical ether.

15 mins ago

Discuss this question LIVE

15 mins ago

Text solutionVerified

(i) Kolbes reaction.
It is a decarboxylative dimerisation of two carboxylic acids (or carboxylate ions) to form carbon carbon bond of alkane.

2 RCO O^{-} - 2 e^{-} - 2 C O_{2} R - R

(ii) Reimer-Tiemann reaction.
It involves the ortho-formylation of phenols. Phenol is converted to salicylaldehyde.

C_{6} H_{5} - O H C H C l_{3} 3 K O H o - H O - C_{6} H_{4} - C H O

(iii) Williamson ether synthesis.
Sodium alkoxide reacts with alkyl halide to form an ether.

C_{2} H_{5} ON a + C_{2} H_{5} Cl \to C_{2} H_{5} - O - C_{2} H_{5} + N a Cl

(iv) Unsymmetrical ether.
Two different alkyl groups are attached to O atom. The general formula is

R - O - R^{'}

. An example is ethyl methyl ether

C H_{3} - C H_{2} - O - C H_{3}

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Practice more questions from Chemistry Part-II (NCERT)

Give equations of the following reactions:
(i) Oxidation of propan-1-ol with alkaline

K M n O_{4}

solution.
(ii) Bromine in

C S_{2}

with phenol.
(iii) Dilute

H N O_{3}

with phenol.
(iv) Treating phenol wih chloroform in presence of aqueous

N a O H

Explain the following with an example.
(i) Kolbes reaction.
(ii) Reimer-Tiemann reaction.
(iii) Williamson ether synthesis.
(iv) Unsymmetrical ether.

Write the mechanism of acid dehydration of ethanol to yield ethene.

View all

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Question Text	Explain the following with an example. (i) Kolbes reaction. (ii) Reimer-Tiemann reaction. (iii) Williamson ether synthesis. (iv) Unsymmetrical ether.
Updated On	Feb 20, 2024
Topic	Alcohols, Phenols and Ethers
Subject	Chemistry
Class	Class 12
Answer Type	Text solution:1 Video solution: 11
Upvotes	1089
Avg. Video Duration	9 min

Explain the following with an example.
(i) Kolbes reaction.
(ii) Reimer-Tiemann reaction.
(iii) Williamson ether synthesis.
(iv) Unsymmetrical ether.

Text solutionVerified

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Explain the following with an example.(i) Kolbes reaction.(ii) Reimer-Tiemann reaction.(iii) Williamson ether synthesis.(iv) Unsymmetrical ether.

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Explain the following with an example.
(i) Kolbes reaction.
(ii) Reimer-Tiemann reaction.
(iii) Williamson ether synthesis.
(iv) Unsymmetrical ether.