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(A) The reactivity of carboxylic acid derivatives towards nucleophilic attack by $LiAlH_4$ depends on the leaving group ability and the electrophilici

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$(a) < (b) < (d) < (c)$

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(A) The reactivity of carboxylic acid derivatives towards nucleophilic attack by $LiAlH_4$ depends on the leaving group ability and the electrophilicity of the carbonyl carbon.The order of reactivity is determined by the stability of the leaving group and the resonance stabilization of the carbonyl group:$1. 	ext{Acid chloride } (C_2H_5COCl) 	ext{ is the most reactive due to the excellent leaving group } Cl^- 	ext{ and strong electron-withdrawing effect.}$$2. 	ext{Acid anhydride } ((C_2H_5CO)_2O) 	ext{ is next, with } RCOO^- 	ext{ as a good leaving group.}$$3. 	ext{Ester } (C_2H_5COOCH_3) 	ext{ follows, with } CH_3O^- 	ext{ as a poorer leaving group.}$$4. 	ext{Amide } (C_2H_5CONH_2) 	ext{ is the least reactive due to strong resonance stabilization of the carbonyl group by the nitrogen lone pair.}$Thus,the increasing order of reactivity is: $(a) < (b) < (d) < (c)$.

The increasing order of the reactivity of the following compounds with $LiAlH_4$ is:
$(a)$ $C_2H_5CONH_2$
$(b)$ $C_2H_5COOCH_3$
$(c)$ $C_2H_5COCl$
$(d)$ $(C_2H_5CO)_2O$

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The increasing order of the reactivity of the following compounds with $LiAlH_4$ is:$(a)$ $C_2H_5CONH_2$$(b)$ $C_2H_5COOCH_3$$(c)$ $C_2H_5COCl$$(d)$ $(C_2H_5CO)_2O$