Which of the following on heating with aqueous $\mathrm{KOH}$, produces acetaldehyde ?

1. $\mathrm{CH}_3 \mathrm{COCl}$
2. $\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{Cl}$
3. $\mathrm{CH}_2 \mathrm{Cl} \mathrm{CH}_2 \mathrm{Cl}$
4. $\mathrm{CH}_3 \mathrm{CHCl}_2$

Asked in: JEE Main 2009

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