The major product formed in the Friedel-Crafts acylation of chlorobenzene is $p-$chloroacetophenone. Identify the correct structure of the major product.

Which of the following is the least reactive in the case of bromination?

The reaction of $2,6-$dideutero-fluorobenzene with $NaNH_2$ in liquid $NH_3$ gives:

Replacement of $Cl$ of chlorobenzene to give phenol requires drastic conditions,but $Cl$ of $2,4$-dinitrochlorobenzene is readily replaced. This is because,

Coupling of benzene diazonium chloride with $1$-naphthol in alkaline medium will give:

Assertion : The presence of nitro group facilitates nucleophilic substitution reactions in aryl halides.
Reason : The intermediate carbanion is stabilized due to the presence of nitro group.