Question

Column I Reactions		Column II Mechanism
a		p	Ring expansion
b		q	Ring contraction
c		r	Carbocation
d		s	Rearrangement
		t	Radical anion

• A. $( a \rightarrow q , r , s ; b \rightarrow p , r , s ; c \rightarrow s ; d \rightarrow r , s , t )$
• B. $( a \rightarrow r , s , t ; b \rightarrow p , r , s ; c \rightarrow s ; d \rightarrow q , s , t )$
• C. $( a \rightarrow q, s , t ; b \rightarrow t , r , s ; c \rightarrow s ; d \rightarrow q , s , t )$
• D. $( a \rightarrow q, p , t ; b \rightarrow t , r , s ; c \rightarrow s ; d \rightarrow q , q , t )$

Answer 1

Answer: (A)

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



c. It is an examnle of Beckmann rearrangement reaction.
d. It is an example of bimolecular reduction (formation of pinacol) followed by acid-catalysed rearrangement reaction to form pinacolone. The formation of pinacol proceeds by the formation of a radical anion intermediate.