Which is the correct reaction coordinate diagram for the following solvolysis reaction?

The products $A$ and $B$ in the following reactions,respectively,are:
$A \xleftarrow{AgNO_2} CH_3-CH_2-CH_2-Br \xrightarrow{AgCN} B$

Which one of the following chlorohydrocarbons readily undergoes solvolysis?

Identify the products formed in the following reaction: $CH_3-CH_2-CH_2-CHBr-CH_3 \xrightarrow{KOH / C_2H_5OH} ?$

Among the following compounds $I-IV$,which one forms a yellow precipitate on reacting sequentially with $(i)$ $NaOH$,$(ii)$ dil. $HNO_{3}$,and $(iii)$ $AgNO_{3}$?

When $32.25 \ g$ of ethyl chloride is dehydrohalogenated,it gives $50\%$ yield of alkene. What is the mass of the product in $g$? (Atomic mass of $Cl = 35.5$)