In alkaline hydrolysis of tert$-$butyl bromide, the order of reaction with respect to nucleophile is _____.

Tertiary butyl bromide is hydrolysed by aqueous $\mathrm{KOH}$. When the concentration of $\mathrm{KOH}$ is increased, the rate of reaction ______.

The increasing order of the reactivity of the following halides for ${\text{S}}_{\text{N}}\text{1}$ reaction is _____

$$\begin{gathered} {\text{CH}}_{\text{3}}{\text{CH(Cl)CH}}_{\text{2}}{\text{CH}}_{\text{3}}{\text{ CH}}_{\text{3}}{\text{CH}}_{\text{2}}{\text{CH}}_{\text{2}}{\text{Cl p-H}}_{\text{3}}{\text{CO-C}}_{\text{6}}{\text{H}}_{\text{4}}{\text{-CH}}_{\text{2}}\text{Cl} \\ \left(\mathrm{I}\right)\text{ (II) (III)} \end{gathered}$$

The decreasing order of reactivity of the following compounds in ${\text{S}}_{\text{N}}\text{1}$ reactions is ______.

$$\begin{gathered} {\text{C}}_{\text{6}}{\text{H}}_{\text{5}}{\text{CH}}_{\text{2}}{\text{Br C}}_{\text{6}}{\text{H}}_{\text{5}}{\text{CH(C}}_{\text{6}}{\text{H}}_{\text{5}}\text{)Br} \\ \text{(i) (ii)} \\ {\text{C}}_{\text{6}}{\text{H}}_{\text{5}}{\text{CH(CH}}_{\text{3}}{\text{)Br C}}_{\text{6}}{\text{H}}_{\text{5}}{\text{C(CH}}_{\text{3}}{\text{) (C}}_{\text{6}}{\text{H}}_{\text{5}}\text{)Br} \\ \text{(iii) (iv)} \end{gathered}$$

Which of the following undergoes nucleophilic substitution by ${\mathrm{S}}_{\mathrm{N}}1$ mechanism?

The CORRECT order of increasing reactivity of $\mathrm{C}—\mathrm{X}$ bond towards nucleophile in the following compounds is ______.

Number of $\text{π}$$-$bonds present in $\mathrm{B}.\mathrm{H}.\mathrm{C}.$ $(\mathrm{Benzene} \mathrm{hexachloride})$ are ______.

The compound '$\mathrm{X}$' in the reaction

In case of $\mathrm{R}, \mathrm{S}-$configuration, the group having the highest priority is ______.