Two useful organic compounds that contain Cl atoms are drawn below. Vinyl chloride is the...

Two useful organic compounds that contain Cl atoms are drawn below. Vinyl chloride is the starting material used to prepare poly(vinyl chloride), a plastic used in insulation, pipes, and bottles. Chloroethane (ethyl chloride) is a local anesthetic. Why is the C-Cl bond of vinyl chloride stronger than the C- Cl bond in chloroethane?