Question

the c-cl bond length in chlorobenzene is shorter than that in CH3-Cl
why?

Answer 1

The carbon in C-Cl bond inchlorobenzene is sp2hybridised, while in CH3-Cl is sp3 hybridised. In sp2hybrid orbitals have more of s -character and hence the carbon ifchlorobenzene withdraws the electron pair between C-Cl with greater force. As a result, C-Cl bond is shorter than CH3-Cl