Verified Solution • 2025–26 Session moderate

QJEEM19Ch72a4: JEE Main 2019 Chemistry - Class 12 JEEM19Ch72a4 Solution: In the following reaction : Aldehyde + Alcohol    ⟶ H …

In the following reaction :

Aldehyde + Alcohol   ⟶HCl  Acetal

Aldehyde                    Alcohol
HCHO tBuOH
CH3CHO MeOH

The best combination is

Multiple Choice Options

  • A CH3CHO and MeOH
  • B HCHO and MeOH
  • C CH3CHO and tBuOH
  • D HCHO and tBuOH

Step-by-Step Verified Solution

In Formaldehyde (HCHO) both side of the C atom H presents but in Acetaldehyde (CH3CHO) one side of C atom -CH3 group and other side H atom presents. So Formaldehyde is less crowded then it is more reactive.

CH3OH is 1o alcohol and tBuOH is 3o alcohol. As we know on 3o alcohol steric hindrance is very high compare to 1o alcohol and due to steric hindrance reactivity of 3o alcohol is less compare to 1o alcohol.

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