Vinylcyclopentane $\xrightarrow{HCl}$ Major product is

The decreasing order of reactivity of the following organic molecules towards $AgNO_3$ solution is:

Considering the above reactions,the compound $A$ and compound $B$ respectively are:

$1-$chloro$-3-$methylbutane on reaction with zinc and dilute hydrochloric acid gives . . . . . . as the major product.

Explain the mechanism of the following reaction: $CH_3Cl + OH^-_{(aq)} \to HO-CH_3 + Cl^-$

Given below are two statements:
Statement $I$: The conversion $CH_3-CH_2-CH_2-CH_2-Cl \xrightarrow{OH^{-}} CH_3-CH_2-CH_2-CH_2-OH + Cl^{-}$ proceeds well in a less polar medium.
Statement $II$: The conversion $(CH_3)_3C-Cl \xrightarrow{OH^{-}} (CH_3)_3C-OH + Cl^{-}$ proceeds well in a more polar medium.
In the light of the above statements,choose the correct answer from the options given below.