${\text{C}}_2{\mathrm{H}}_5\mathrm{Cl}\underset{{\mathrm{Ag}}_2\mathrm{O}}{\overset{\mathrm{Moist}}{\to }}\left(\mathrm{A}\right)\underset{360°\mathrm{C}}{\overset{{\mathrm{Al}}_2{\mathrm{O}}_3}{\to }}\left(\mathrm{B}\right)\stackrel{{\mathrm{S}}_2{\mathrm{Cl}}_2}{\to }\left(\mathrm{C}\right)$

In the above sequence of reactions, identify (C)

${\mathrm{C}}_2{\mathrm{H}}_5\mathrm{Cl}\underset{{\mathrm{Ag}}_2\mathrm{O}}{\overset{\mathrm{Moist}}{\to }}{\mathrm{C}}_2{\mathrm{H}}_5\mathrm{OH}\underset{360°\mathrm{C}}{\overset{{\mathrm{Al}}_2{\mathrm{O}}_3}{\to }}{\mathrm{CH}}_2=\mathrm{C}{\mathrm{H}}_2\stackrel{{\mathrm{S}}_2{\mathrm{Cl}}_2}{\to }\mathrm{Cl}-{\mathrm{CH}}_2-{\mathrm{CH}}_2-\mathrm{S}-{\mathrm{CH}}_2-{\mathrm{CH}}_2-\mathrm{Cl}$

The product formed in the above reaction is known as Mustard gas.

Sulfur mustard is a kind of chemical warfare agent. When these agents come into contact with the skin and mucous membranes, they produce blistering. They are known as vesicants or blistering agents. Other names for sulphur mustard include "mustard gas or mustard agent".

Hence, the correct answer is option (C) Mustard gas.