Which one of the following involves nucleophilic addition

Options

A. Kolbe’s reaction of phenol
B. Williamson’s synthesis of ethers
C. Reimer – Tiemann’s reaction of phenol
D. Aldol formation from ethanal

Answer

D

Explanation

Kolbe’s reaction of phenol : it is an electrophilic substitution reaction.
Williamson’s synthesis of ethers : It occurs by `SN_2` mechanism.
Reimer - Tiemann’s reaction of phenol : It is an example of electrophilic substitution reaction involving dichlorocarbene as the electrophile.
Kolbe’s electrolytic synthesis of ethane from sodium acetate : It involves free radical mechanism.
Aldol formation from ethanal : it is nucleophilic addition reaction.