In the above sequence of reactions, identify (C)

Ethyl chloride on treatment with dry silver oxide forms ethanol.

Ethanol on heating with alumina to a temperature of 350oC forms ethene.

Ethene reacts with S₂​Cl₂​ to form mustard gas (compound C).

C_2​H₅​Cl $\stackrel{\mathrm{dry} {\mathrm{Ag}}_2\mathrm{O}}{\to }$ ​C₂​H₅​−OH$\underset{{350}^0\mathrm{C}}{\overset{{\mathrm{Al}}_2{\mathrm{O}}_3}{\to }}$ ​CH₂​=CH₂$\stackrel{{\mathrm{S}}_2{\mathrm{Cl}}_2}{\to }$​​Cl−CH₂​−CH₂​−S−CH₂​−CH₂​−Cl