Question

Match the reactions in Column I with appropriate options in Column II.

Column I		Column II
A		p	Racemic mixture
B		q	Addition reaction
C		r	Substitution reaction
D		s	Coupling reaction
		t	Carbocation intermediate

• A. $( A ) \rightarrow( R ),( T ) ;( B ) \rightarrow( S ) ;( C ) \rightarrow( P ),( Q ) ;( D ) \rightarrow( R )$
• B. $( A ) \rightarrow( Q ),( R ) ;( B ) \rightarrow( T ) ;( C ) \rightarrow( P ),( Q ) ;( D ) \rightarrow( T )$
• C. $( A ) \rightarrow( R ),( T ) ;( B ) \rightarrow( T ) ;( C ) \rightarrow( P ),( Q ) ;( D ) \rightarrow( T )$
• D. $( A ) \rightarrow( R ),( S ) ;( B ) \rightarrow( T ) ;( C ) \rightarrow( P ),( Q ) ;( D ) \rightarrow( R )$

Answer 1

Answer: (D)

$(A-r, s, t) ;(B-t) ;(C-p, q) ;(D-r)$
(A) It is an example of electrophilic substitution reaction which results in coupled product hence it is coupling reaction also.
(B) Pinacole-pinacolone rearrangement. In this reaction intermediate is carbocation.
(C) It is an example of addition reaction by carbony1 compounds and both enantiomers will be formed. Hence, racemic mixture will be obtained.

(D) It is an example of nucleophilic substitution.