The dipole moment of vinyl chloride is lower than that of methyl chloride. This is due to

Explanation

In chlorobenzene, Cl is attached to a `sp^(2)`-hybrid carbon while in cyclohexyl chloride, it is attached to a `sp^(3)`-hybrid carbon.

The `sp^(2)`-hybrid carbon due to greater s-character is more electronegative than a `sp^(3)`-hybrid carbon. therefore, `sp^(2)`-hybrid carbon of C-Cl bond in chlorobenzene has less tendency to release electrons to the Cl atom than a `sp^(3)`-hybrid carbon in cyclohexyl chloride. As a result, C-Cl bond in chlorobenzene is less polar than in cyclohexyl chloride. in other words, chlorobenzene has lower dipole moment (1.69 D) as compared to that of cyclohexyl chloride (1.86 D).