why does CH3Cl(electronegativity difference =0.5) have a larger dipole moment than CH3F (electronegativity difference =1.5)__________ according to the electronegativity difference, it should be opposite but is not so why??????

Dear shreya k,

CH₃F has less dipole moment than CH₃Cl because of short C-F bond length.(dipole moment=qd)

CH3F has more dipole moment since F is more electronegative as compared to chlorine and attracts the shared pair of electrons between CH3 and itself more towards itself.

This is an exception so study this well 

Hope this helped you immensely....

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Regards,

AskIITians Expert,

Godfrey Classic Prince

IIT-Madras

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