The major product $A$ obtained in the above reaction is:

Which of the following represent free radical substitution reaction $(FSR)$,electrophilic addition reaction $(EAR)$ and nucleophilic addition reaction $(NAR)$?
$I. CH_3-CH=CH_2 \xrightarrow{Cl_2/CCl_4} CH_3-CHCl-CH_2Cl$
$II. CH_3-CO-CH_3 \xrightarrow{HCN/OH^-} CH_3-C(OH)(CN)-CH_3$
$III. CH_3-CH_2-CH_3 \xrightarrow{Cl_2/h\nu} CH_3-CHCl-CH_3$

$A$ rather interesting example of the Wolff rearrangement with $2$-diazocyclohexanone in methanol is given below. Identify the major product.

The product is:

In which of the following reactions is a carbanion $NOT$ formed as an intermediate?

The heterolytic cleavage of a carbon-chlorine bond gives: