First slide
Polarity of the bond and Dipolemoment

Which of the following molecules has the maximum dipole moment?



In NH3 is less electronegative than N  and hence dipole moment of each N-H bond is towards N and create high net dipole moment whereas in NF3, F is more electronegative than N, the dipole moment of each N-F bond is opposite to that of lone pair, hence reducing the net dipole moment.

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