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(D) In the given reaction,$p$-toluidine reacts with $NaNO_2$ and $HCl$ at $273-278 \ K$ to form a diazonium salt,which is $p$-methylbenzenediazonium c

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(D) In the given reaction,$p$-toluidine reacts with $NaNO_2$ and $HCl$ at $273-278 \ K$ to form a diazonium salt,which is $p$-methylbenzenediazonium chloride.This diazonium salt then undergoes an electrophilic aromatic substitution (coupling reaction) with $N$-phenylpyrrolidine in the presence of $H^+$.The coupling reaction occurs at the para-position of the $N$-phenylpyrrolidine ring because the pyrrolidinyl group is a strong ortho/para-directing group and the para-position is sterically less hindered.Thus,the major product is the para-coupled azo dye as shown in option $D$.

The major product in the following reaction is:

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