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Q.

Column I Reactions Column II Mechanism

a p Vinylic radical

b q Radical anion

c r trans-Vinylic anion

d s Concerted mechanism

Alcohols Phenols and Ethers

A

$( a \rightarrow q ; b \rightarrow p , q , r ; c \rightarrow s ; d \rightarrow s )$

B

$( a \rightarrow s ; b \rightarrow p , q , r ; c \rightarrow q ; d \rightarrow s )$

C

$( a \rightarrow p ; b \rightarrow s, q , r ; c \rightarrow q ; d \rightarrow r )$

D

$( a \rightarrow r ; b \rightarrow s, q , p ; c \rightarrow s ; d \rightarrow q )$

Solution:

$( a \rightarrow q ; b \rightarrow p , q , r ; c \rightarrow s ; d \rightarrow s )$
a. It is pinacol formation which proceeds by radical anion.
b. It is Birch reduction which proceeds by the formation

c. It is an example of Claisen rearrangement reaction and proceeds by concerted mechanism.
d. It is an example of Diels-Alder reaction and proceeds by concerted mechanism.