The correct name of the given reaction is

$$\mathrm{Ar}-\mathrm{N}_2^{+} \mathrm{X}^{-} \xrightarrow{\mathrm{CuCN} / \mathrm{KCN}} \mathrm{Ar}-\mathrm{CN}+\mathrm{N}_2$$

Auto-oxidation of chloroform in air and light produces a poisonous gas known as

In which of the following molecules, C atom marked with asterisk is chiral?

Assertion (A): Inversion of configuration is observed in $\mathrm{S}_{\mathrm{N}} 2$ reaction.

Reason (R): The reaction proceeds with the formation of carbocation.