The reaction of cyclohexane epoxide with ${\mathrm{NaN}}_3$ in aqueous dioxane would give

The order of the rate of formation of carbocations from the following iodo compounds is :

Indicate the order of reactivity of the following compounds in nucleophilic substitution (unimolecular) reaction

The intermediate formed in the following reaction is :

 +$\mathrm{NaCl}$

The product $\left(\mathrm{C}\right)$ of the following sequence of reactions is

 $+{\mathrm{CH}}_2={\mathrm{CH}}_2$ $\underset{\left(\mathrm{ii}\right) {\mathrm{H}}_2\mathrm{O}}{\overset{\left(\mathrm{i}\right) {\mathrm{AgCl}}_3}{\to }} \mathrm{A}$ $\underset{\mathrm{hv}}{\overset{{\mathrm{Cl}}_2 \left(\mathrm{limited}\right)}{\to }} \mathrm{B}$ $\stackrel{\mathrm{aq}. \mathrm{NaOH}}{\to } \mathrm{C}$

The order of reactivity of ammonia with the following compound is :

$\left(\mathrm{I}\right)$ ${\mathrm{CH}}_2=\mathrm{CHBr}$

$\left(\mathrm{II}\right)$ ${\mathrm{CH}}_3-{\mathrm{CH}}_2-\mathrm{COCl}$

$\left(\mathrm{III}\right)$ ${\mathrm{CH}}_3-{\mathrm{CH}}_2-{\mathrm{CH}}_2-\mathrm{Cl}$

$\left(\mathrm{IV}\right)$ ${\left({\mathrm{CH}}_3\right)}_3\mathrm{CO}-\mathrm{Br}$