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Question:

In the following reaction, Aldehyde + Alcohol →HCl Acetal. The best combinations are: HCHO and MeOH, HCHO and t-BuOH, CH3CHO and MeOH, CH3CHO and t-BuOH

CH3CHO and MeOH

HCHO and MeOH

HCHO and t-BuOH

CH3CHO and t-BuOH

Solution:

The correct option is A HCHO and MeOH. Rate ∝ 1. Steric crowding of aldehyde t-butanol can show formation of carbocation in acidic medium.