Question

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

Answer 1

$(a\to r,s,t;b\to t;c\to p,q;d\to r)$
$(a\to r,s,t)$ It is an example of electrophilic substitution reaction which results in a coupled product; hence it is coupling reaction also. It also involves carbocation intermediate.
($b\to t$) Pinacole-pinacolone rearrangement. In this reaction, the intermediate is carbocation.
($c\to p,q$) It is an example of addition reaction by carbonyl compounds and both enantiomers will be formed. Hence, racemic mixture will be obtained. (see diag)
($d\to r$) It is an example of nucleophilic substitution.