Which of the following compounds is most reactive towards $S_N1$ reaction?

Which of the following compounds would react faster with $NaCN$ in an $S_N2$ reaction?

Consider the following reaction:
(Cyclohexyl)methyl chloride + $CH_3ONa$ $\rightarrow$ $1-$(methoxymethyl)cyclohex$-1-$ene.
The mechanism of the reaction will be:

At $30\,^\circ C$,the rate of reaction between $2$-bromobutane and $OH^-$ in $75\%$ ethanol and $25\%$ water is given by: $\text{Rate} = 3.20 \times 10^{-5} [2\text{-bromobutane}][OH^-] + 1.5 \times 10^{-6} [2\text{-bromobutane}]$. If $[OH^-] = 1.0\,M$,what percentage of the reaction proceeds via the $S_N2$ mechanism?

In solvolysis of $1,2$-dimethylpropyl $p$-toluenesulfonate in acetic acid at $75\,^oC$,how many (alkene + substitution) products will be formed?

Match the following reactants with their corresponding products:
Reactants:
$(A)$ $C_2H_5Cl$,moist $Ag_2O$
$(B)$ $C_2H_5Cl$,ethanolic $AgCN$
$(C)$ $C_2H_5Cl$,ethanolic $AgNO_2$
$(D)$ $C_2H_5Cl$,ethanolic $KOH$
Products:
$(i)$ $CH_3CH_2ONO$
$(ii)$ $C_2H_4$
$(iii)$ $CH_3CH_2OH$
$(iv)$ $CH_3CH_2NC$
Select the correct match: