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Which of the following on heating with aqueous KOH, produces acetaldehyde?

1. CH3CH2Cl
2. CH2ClCH2Cl
3. CH3CHCl2
4. CH3COCl

Correct answer: CH3CHCl2

Solution

Heating CH3CHCl2 with aqueous KOH leads to dehydrohalogenation, resulting in the formation of acetaldehyde through an elimination reaction where a hydrogen and a chlorine atom are removed.

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