Q.

Amongst the trihalides of nitrogen which one has the highest dipole moment?

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a

NCl3

b

NI3

c

NF3

d

NBr3

answer is B.

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Detailed Solution

The dipole moment is strongest in NI3. The electronegativity falls off as we descend the group. Therefore, F is the most electronegative and I is the least. The dipole moment will, however, be directed toward the halogen since Cl, Br, and I are less electronegative than N.

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