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Among the given compounds, the most susceptible to nucleophilic attack at the carbonyl group is
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$\mathrm{CH}_3 \mathrm{COCl}$
Key Idea Lesser the electron density of acyl carbon atom, more will be the susceptibility of nucleophile to attack it.
The $\mathrm{Cl}$ atom has strong $-I$ effect and weakest $+\mathrm{R}$ effect because of the weak $\pi$-bond between the small sized $\mathrm{C}$-atom and large sized $\mathrm{Cl}$ atom. Thus, in $\mathrm{CH}_3 \mathrm{COCl}$, acyl carbon has least electron density and hence, more susceptible for nucleophilic attack.
The $\mathrm{Cl}$ atom has strong $-I$ effect and weakest $+\mathrm{R}$ effect because of the weak $\pi$-bond between the small sized $\mathrm{C}$-atom and large sized $\mathrm{Cl}$ atom. Thus, in $\mathrm{CH}_3 \mathrm{COCl}$, acyl carbon has least electron density and hence, more susceptible for nucleophilic attack.
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