The product obtained by the reaction of ethyl bromide with alcoholic silver nitrite is .............. .

Which of the following compounds undergoes nucleophilic substitution reaction most easily via the $S_{N}1$ mechanism?

The correct reactivity order of the following compounds towards alkaline hydrolysis is:-
$I. \ p-CH_3O-C_6H_4-CH_2Cl$
$II. \ C_6H_5-CH_2Cl$
$III. \ p-CH_3-C_6H_4-CH_2Cl$
$IV. \ m-CH_3-C_6H_4-CH_2Cl$

The decreasing order of reactivity towards $S_N 1$ reaction for the following compounds is:

$1,2-dichlorocyclopentane$ $\xrightarrow{1 \text{ equivalent } Mg, \text{ ether}} X$ $\xrightarrow{D_2O} Y;$
$Y$ is:

Which is the correct reactivity order for $E_2$ reaction with alcoholic $KOH$?