Which of the following orders of dipole momen | vedclass

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Question

(D) $1$. $BF_3$ is a planar molecule with a symmetric structure, so its net dipole moment is $0 	ext{ D}$.$2$. Both $NH_3$ and $NF_3$ are pyramidal.

Vedclass · Accepted Answer

$NH_3 > NF_3 > BF_3$

Vedclass · Answer

(D) $1$. $BF_3$ is a planar molecule with a symmetric structure, so its net dipole moment is $0 	ext{ D}$.$2$. Both $NH_3$ and $NF_3$ are pyramidal. In $NH_3$, the dipole moments of the $N-H$ bonds and the lone pair on $N$ are in the same direction, reinforcing each other. In $NF_3$, the dipole moments of the $N-F$ bonds are in the opposite direction to the lone pair, partially cancelling each other out.$3$. Therefore, the order of dipole moments is $NH_3 (1.46 	ext{ D}) > NF_3 (0.24 	ext{ D}) > BF_3 (0 	ext{ D})$.$4$. The correct order is $NH_3 > NF_3 > BF_3$.

Which of the following orders of dipole moment for the stated molecules is correct?

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