Indicate the correct order of bond energy for the following.

Which of the following chiral compounds undergoes nucleophilic substitution by $OH^-$ ions to form a racemic mixture?
$(a)$ $CH_3-CH(Br)-C_2H_5$
$(b)$ $CH_3-C(Br)(CH_3)-C_2H_5$
$(c)$ $CH_3-CH(C_2H_5)-CH_2Br$

$CH_3-CH_2-Cl \xrightarrow{alc. KOH} A$,the product is

Consider the following reaction,
$C_2H_5Cl + AgCN \xrightarrow{EtOH / H_2O} \underline{X} \text{ (major)}$
Which one of the following statements is true for $\underline{X}$?
$(I)$ It gives propionic acid on hydrolysis
$(II)$ It has an ester functional group
$(III)$ It has a nitrogen linked to ethyl carbon
$(IV)$ It has a cyanide group

The product $B$ formed in the following reaction sequence is:

Among the following,the compound which undergoes the fastest solvolysis is