(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 carbonyl compounds and both enantiomers will be formed. Hence, racemic mixture will be obtained.
(D) It is an example of nucleophilic substitution.