Ncert Exercises & Solutions

Match the reactions from Column-I with their corresponding descriptions from Column-II and select the correct option.

	Column-l (Name of Reaction)		Column-ll (Description of Reaction)
A.	Reimer-Tiemann reaction	I.	Conversion of phenol to o-hydroxysalicylic aid
B.	Kolbe's reaction	II.	Heated copper at 573K
C.	Conversion of 2 $°$ alcohol to a ketone	III.	Reaction of an alkyl halide with sodium alkoxide
D.	Williamson's synthesis	Iv.	Conversion of phenol to salicylaldehyde

Codes:

	A	B	C	D
1.	II	III	IV	I
2.	III	IV	I	II
3.	I	IV	III	II
4.	IV	I	II	III

Hint: Williamson's synthesis reaction is used to make an ether.

A. On treating phenol with chloroform in the presence of NaOH, an aldehydic group is introduced at the ortho position of the benzene ring. The reaction is as follows:

B. In Kolbe’s reaction, 2-hydroxy benzoic acid (salicylic acid) is prepared by the reaction of phenol with ${CO}_{2}$ gas.

SOLVED] Explain Kolbe's reaction with an equation.

C. When a 2° alcohol is allowed to pass overheated copper at 573 K, dehydrogenation takes place and a ketone is formed.

$R - CH - R' \to_{573 K}^{Cu} R - C - R$
$I$ $∥$
$OH$ $O$

D. Williamson synthesis is an important method for the preparation of ethers. In this method, an alkyl halide is allowed to react with sodium alkoxide.

R—X +R—ONa $\to$ ROR + NaX

NEET Information

courses

Company

Botany Questions

Chemistry Questions

Physics Questions

Zoology Questions