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(A) The reaction of $N,N$-dimethylaniline with $NaNO_2/HCl$ at $273-278 \ K$ is an electrophilic aromatic substitution reaction. Since the $-N(CH_3)_2

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$N,N$-dimethyl-$4$-nitrosoaniline

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(A) The reaction of $N,N$-dimethylaniline with $NaNO_2/HCl$ at $273-278 \ K$ is an electrophilic aromatic substitution reaction. Since the $-N(CH_3)_2$ group is a strong ortho/para-directing group,the electrophile $NO^+$ (nitrosonium ion) attacks the para-position due to steric hindrance at the ortho-position. Thus,the main product formed is $N,N$-dimethyl-$4$-nitrosoaniline.

The main product of the following reaction will be:

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