(a)
O
$\parallel \$
$X\underset{(ii)Zn/AcOH}{\overset{{\ \ \ \ \ \ \ \ (i)O}_{3}\ \ \ \ \ \ \ \ \ \ \ \ }{\rightarrow}}C_{2}H_{4}O + CH_{3}CH_{2} - C - CH_{3}$
Aldehyde 2-butanone
The aldehyde should be $CH_{3}CHO$ because the molecular formula is $C_{2}H_{4}O$.
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