The order of reactivity of the following alkyl bromides towards $S_N1$ reactions is:
$a$) $(CH_3)_2CHBr$
$b$) $CH_3CH_2Br$
$c$) $(CH_3)_3CBr$

The major product obtained in the following reaction is $C_2H_5ONa + (CH_3)_3C-Cl \rightarrow$

Which of the following is most reactive toward $S_{N}2$ reaction?

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

Which of the following reagents is used in the preparation of nitroalkane from haloalkane?

$2-$bromopentane is heated with potassium ethoxide in ethanol. The major product obtained is