Lewisite can be prepared by using which of the following combinations

Lewisite is a poisonous gas used as a chemical weapon. It acts as a Vesicant (blister agent) and Lung irritant. Lewisite is an addition product of Acetylene and ${\text{AsCl}}_{\text{3}}$

$\text{HC}\equiv {\text{CH + AsCl}}_{\text{3}}\stackrel{{\text{AlCl}}_{\text{3}}}{\to }{\text{ Cl-CH}}_{ }{\text{=CH}}_{\text{2}}{\text{-AsCl}}_{\text{2}}$