Benzene hexachloride is

Which of the following rules applies in the reaction:
$CH_3CHBrCH_2CH_3 \xrightarrow{alc. KOH}$
$(i)$ $CH_3CH = CHCH_3$ (major product)
$(ii)$ $CH_2 = CHCH_2CH_3$ (minor product)

Identify the major product formed in the following reaction: $3-$Bromo$-2-$methylpentane $\xrightarrow{Alc. KOH, \Delta}$ Major product

In the following pairs of halogen compounds,which would undergo $S_{N}2$ reaction faster?
$(i)$ Cyclohexylmethyl chloride and Chlorocyclohexane
(ii) $n$-Butyl iodide and $n$-Butyl chloride

The reaction $RCl + NaI \xrightarrow{\text{Acetone}} R-I + NaCl$ is known as:

Which of the following halides undergoes hydrolysis most rapidly?