The reaction of aryl halide with sodium metal in dry ether to give biphenyl is known as

In nucleophilic substitution reactions,alkyl halides are more reactive than aryl halides because...

Assertion : Cyanide $(CN^{-})$ is a strong nucleophile.
Reason : Benzonitrile is prepared by the reaction of chlorobenzene with potassium cyanide.

Identify $Y$ in the following reaction.

Identify the major product formed when $p$-isopropyltoluene (also known as $p$-cymene) reacts with a mixture of concentrated $HNO_3$ and concentrated $H_2SO_4$.

Assertion : Chloral reacts with chlorobenzene to form $DDT$.
Reason : It is an electrophilic substitution reaction.