$C_2H_5Br$ $\xrightarrow{KCN} A$ $\xrightarrow{\text{Hydrolysis}} B$
The compound $A$ in the above reaction is

The major product obtained from the reaction of $CH_3CH_2CH(F)CH_3$ with $CH_3O^- / CH_3OH$ is ..........

$A$ solution of $(\pm)-2$-chloro-$2$-phenylethane in toluene is mixed slowly with a small amount of $SbCl_5$. The reaction proceeds due to the formation of:

$ . . . . . . $ compound is slowly oxidized by air in the presence of light to an extremely poisonous gas,carbonyl chloride.

$A$ $(C_{4}H_{8}Cl_{2})$ $\xrightarrow{\text{Hydrolysis at } 373 \text{ K}}$ $B$ $(C_{4}H_{8}O)$
$B$ reacts with hydroxylamine but does not give Tollen's test. Identify $A$ and $B$.

The major product formed in the dehydrohalogenation reaction of $2-Bromopentane$ is $Pent-2-ene$. This product formation is based on?