Carbonyl carbons undergo nucleophilic attack at the alkyl carbon to give additional products. Which of the following sites labelled (I-IV) in semi carbazide is the attacking species when it is reacted with ?
Semi carbazide:
I
II
III
IV
Out of the sites I-IV, the most nucleophilic site is I as lone pairs II and IV are in conjugation with the carboxyl group.
Hence, the correct answer is option (1).