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# Among the given compounds, the most susceptible to nucleophilic attack at the carbonyl group is

(a) Mecocl

(b) MeCHO

(c) MeCOOMe

(d) MeCOOCOMe

Among aldehydes and acid derivatives, acid chlorides are most susceptible to nucleophilic attack because of strong -I effect and weak +R effect of Cl atom, due to this the carbonyl carbon has highest electron deficiency .
Hence order is $MeCOCl > MeCOOCOMe > MeCOOMe > MeCHO$
Hence a is the correct answer.