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Assertion (A): Among nitrogen halides $N X_{3}$ , the dipole moment is highest for $N I_{3}$ and lowest for $N F_{3}$ .
Reason (R): Nitrogen halides $N X_{3}$ , have trigonal pyramidal structure.

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An Intiative by Sri Chaitanya

A and R are true and R is explaining A

A is true and R is false

A is false R is true

A and R are true and R is not explaining A

answer is B.

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Detailed Solution

In case of $N I_{3}$ , the lone pair moment adds on the resultant of the $N - I$ moments but in case of $N F_{3}$ , the lone pair moment on N partly cancels the resultant $N - F$ moments.

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