The reaction is as follows (According to Markownikoffs rule) $ \underset{\text{Vinyl}\,\,\text{chloride}}{\mathop{C{{H}_{2}}==CH\cdot Cl}}\,+HCl\xrightarrow{{}}\underset{\text{1,}\,\,\text{1-dichloro}\,\text{ethane}}{\mathop{C{{H}_{3}}--CHC{{l}_{2}}}}\, $