Compound X on reaction with $O_3$ followed by $Zn/H_2O$ gives formaldehyde and 2-methyl propanal as products. The compound X is:

A Pent-2-ene

B 3-Methylbut-1-ene

C 2-Methylbut-1-ene

D 2-Methylbut-2-ene

The answer is B.

Solution

$CH_3-CH(CH_3)-CH=CH_2 \xrightarrow[(ii)\ Zn/H_2O]{(i)\ O_3} (CH_3)_2CH-CHO + HCHO$ 2-methylpropanal + formaldehyde So X is 3-methylbut-1-ene.

Concept identify alkene from ozonolysis products

2 questions from this chapter have appeared across 2 exam years.