C - Cl bond in methyl chloride compared to C - Cl bond in chlorobenzene is

Step-by-step solution

In chlorobenzene, the lone pair of electrons on the chlorine atom is in conjugation with the -electron system of the benzene ring. This resonance imparts a partial double bond character to the C - Cl bond. In methyl chloride, no such resonance is possible, and the C - Cl bond is a pure single bond. Due to the partial double bond character, the C - Cl bond in chlorobenzene is shorter and stronger than a pure single bond. Therefore, the C - Cl bond in methyl chloride is longer and weaker compared to the C - Cl bond i