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The dipole moment in chlorobenzene is …

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The dipole moment in chlorobenzene is lower than that of cyclohxyl chloride...why???
  • 2 answers

Shefali Mourya 6 years, 9 months ago

Due to sp2 hybridisation of C-atom in chlorobenzene, C-atom is more electronegative whereas in cyclohexyl chloride,C-atom is sp hybridised, i.e. less electronegative So, polarity of C—Cl bond in chlorobenzene is less than the C—Cl bond in cyclohexyl chloride. Further, due to delocalisation of lone pair of electrons of Cl-atom over the benzene ring, C—Cl bond in chlorobenzene acquires some double bond character while C—Cl bond in cyclohexyl chloride is a pure single bond. Thus, C—Cl bond in chlorobenzene is shorter than in cyclohexyl chloride. As dipole moment is a product of charge and distance, therefore, the dipole moment of chlorobenzene is lower than that of cyclohexyl chloride.

Go Pi 6 years, 9 months ago

Dipole moment is explained by the polarity off the atoms. Electron density is more on the less electro negative atom in the case of chlorobenzene I.e on the carbon due to resonance. While there is partial negative and partial positive charge exist in the latter case, giving net dipole moment.
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