In the following reaction,'A' is | vedclass

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(B) The reaction involves the nucleophilic attack of the $-NH_2$ group on the electrophilic carbonyl carbon of diethyl carbonate,followed by the loss

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(B) The reaction involves the nucleophilic attack of the $-NH_2$ group on the electrophilic carbonyl carbon of diethyl carbonate,followed by the loss of an ethanol molecule to form a carbamate intermediate. Subsequently,the lone pair of the oxygen atom from the $-CH_2OH$ group attacks the carbonyl carbon of the carbamate,leading to the elimination of another molecule of ethanol and the formation of a cyclic five-membered oxazolidin$-2-$one derivative.

In the following reaction,'$A$' is

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