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The dipole moment of chlorobenzene is less than cyclohexyl chloride as in chloro benzene because C-Cl bond is sp 2 hybridised where as in cyclohexyl chloride the C-Cl bond is SP 3 Hybridised . Since sp 2 has more s character and more electronegative than sp 3 . Also, In chlorobenzene resonance gives rise to partial double bond charcter to the carbon- halogen bond, making it stronger by reducing the polarity of the carbon -halogen bond. Hence, chlorobenzene is less polar than cyclohexyl chloride.

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Haloalkanes and Haloarenes

Short Answer Type

301.
Explain why the dipole moment of chlorobenzene is lower than that of cyclohexyl chloride?

The dipole moment of chlorobenzene is less than cyclohexyl chloride as in chloro benzene because C-Cl bond is sp² hybridised where as in cyclohexyl chloride the C-Cl bond is SP³ Hybridised . Since sp² has more s character and more electronegative than sp³. Also, In chlorobenzene resonance gives rise to partial double bond charcter to the carbon- halogen bond, making it stronger by reducing the polarity of the carbon -halogen bond. Hence, chlorobenzene is less polar than cyclohexyl chloride.

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