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(C) The reaction sequence is as follows:$1$. $N$-acylation of aniline with $(CH_3CO)_2O$ in the presence of pyridine yields acetanilide $(C_6H_5NHCOCH

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$4-$Nitroaniline

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(C) The reaction sequence is as follows:$1$. $N$-acylation of aniline with $(CH_3CO)_2O$ in the presence of pyridine yields acetanilide $(C_6H_5NHCOCH_3)$.$2$. Nitration of acetanilide using concentrated $HNO_3$ and concentrated $H_2SO_4$ occurs primarily at the para-position due to the steric hindrance of the bulky $-NHCOCH_3$ group,forming $p$-nitroacetanilide.$3$. Finally,acid-catalyzed hydrolysis $(H_2O/H^+)$ of $p$-nitroacetanilide removes the acetyl group to yield $p$-nitroaniline ($4$-nitroaniline) as the major product.

The major product formed in the following reaction sequence is:

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