Which among the following alkyl halides gives more than one product upon dehydrohalogenation?

Major product of the reaction is :

Tertiary alkyl halide is practically $inert$ to substitution by $S_{N}2$ mechanism because of:

Which of the following compounds is not chiral?

In the following reactions,
$(i) CH_3-CH(CH_3)-CH(OH)-CH_3 \xrightarrow{H^{+}/\text{heat}} A \text{ [Major product]} + B \text{ [Minor product]}$
$(ii) A$ $\xrightarrow[\text{in absence of peroxide}]{HBr, \text{dark}} C \text{ [Major product]} + D \text{ [Minor product]}$
the major products $(A)$ and $(C)$ are respectively:

Which of the following are correct statements about $C_2H_5Br$?