Formation of $2-$butene from $2-$bromobutane is according to

On monochlorination of $2-$methylbutane,the total number of chiral compounds is

Which of the following compounds is most rapidly hydrolysed by $S_N1$ mechanism?

Identify $A$ and $B$ in the chemical reaction.

Product $(A)$ is :

Given below are two statements:
Statement $I$: $(CH_3)_3C-CH_2-Cl$ will undergo $S_N1$ reaction even though it is a primary halide.
Statement $II$: It will not undergo $S_N2$ reaction very easily even though it is a primary halide.
In the light of the above statements,choose the most appropriate answer from the options given below: