When $1$-chloro butane is treated with aqueous $\mathrm{KOH}$ it gives $\mathrm{P}$. However, when it is treated with alcoholic $\mathrm{KOH}$ it gives $\mathrm{Q}$. Identify the products $\mathrm{P}$ and $\mathrm{Q}$ respectively

In the reaction

The increasing order of reactivity of the following compounds towards reaction with alkyl halides directly is:

$\left(i\right)$

$\left(ii\right)$

$\left(iii\right)$

$\left(iv\right)$

The major product of the following reaction is:

For the following compounds the correct statement(s) with respect to nucleophilic substitution reactions is(are)

The reagent required for the following two step transformation are