Chlorocyclohexane dipole moment

Because carbon is sp hybridized m chlorobenzene it is more electronegative than the sp hybridized carbon of chlorocyclohexane Consequently the withdrawal of electron density away from carbon by chlorine is less pronounced m aryl halides than m alkyl halides and the molecular dipole moment is smaller... 

Except for fluorocyclohexane and chlorocyclohexane, the lower-energy conformer for all molecules examined has the smaller dipole moment. This is in accord with Coulomb s law (increased separation of charge leads to increased energy). 

The bond polarities of aryl-halogen and aryl-oxygen bonds compared to those in alkyl hahdes and alcohols provide a measure of the effect of the sp hybrid orbital on the O bond and of the resonance interactions between the nonbonded electrons of the substituent and the aromatic ring. The dipole moment of chlorobenzene is smaller than the dipole moment of chlorocyclohexane. 

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