The Dipole Moments Of The Given Molecules Are Such That:

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Question

The dipole moments of the given molecules are such that:

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Solution

Correct option is

NH₃ > NF₃ > BF₃

This is due to different directions of the bond moments of N – H and N – F bonds. In NH₃, N is more electronegative but in NF₃, F is more electronegative. Thus in NH₃, the dipole-moment of N – F bond are in the same direction as that of the love pair. BF₃ being trigonal planer has zerodipole moment.