Question

Which one is a nucleophilic substitution reaction among the following?

• A.
• B. $C{H}_{3}CHO+HCN\to C{H}_{3}CH\left(OH\right)CN$
• C.
• D.

Answer 1

The correct option is C

(1) is electrophilic addition reaction, water molecule get added to the alkene.
(2) is nucleophilic addition reaction across carbonyl group where the nucleophile attacks the carbonyl carbon.
(3) is nucleophilic substitution reaction where $Br$ is substituted by $N{H}_2$ group.
(4) is nucleophilic addition reaction of HCN across carbonyl group.

Hence, option (c) is correct.