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(D) The starting material is $1$-chloroethen$-1-$ol,which is the enol form of acetyl chloride $(CH_3COCl)$.Reaction with $Br_2$ leads to $\alpha$-brom

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(D) The starting material is $1$-chloroethen$-1-$ol,which is the enol form of acetyl chloride $(CH_3COCl)$.Reaction with $Br_2$ leads to $\alpha$-bromination of the carbonyl compound (or electrophilic addition followed by elimination),yielding bromoacetyl chloride,$BrCH_2COCl$,as intermediate $(P)$.Reaction of $BrCH_2COCl$ with methanol $(CH_3OH)$ is a nucleophilic acyl substitution reaction.The methoxy group $(-OCH_3)$ replaces the chloride atom $(-Cl)$ to form methyl bromoacetate,$BrCH_2COOCH_3$,which is product $(Q)$.

The product $(Q)$ is

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