Select the incorrect statement from the follo | vedclass

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(C) $1$. Both $NH_3$ and $NF_3$ have a pyramidal geometry with a lone pair on the $N$ atom.$2$. In $NH_3$, the dipole moments of the three $N-H$ bonds

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In $NH_3$ and $NF_3$, the orbital dipole due to lone pair is in the same direction as that of the resultant dipole moment of the other three bonds.

Vedclass · Answer

(C) $1$. Both $NH_3$ and $NF_3$ have a pyramidal geometry with a lone pair on the $N$ atom.$2$. In $NH_3$, the dipole moments of the three $N-H$ bonds are directed towards the more electronegative $N$ atom, and the dipole moment of the lone pair is also in the same direction. Thus, they add up to a large resultant dipole moment $(1.46 \ D)$.$3$. In $NF_3$, the $F$ atoms are more electronegative than $N$. The dipole moments of the three $N-F$ bonds are directed away from the $N$ atom, which opposes the direction of the lone pair's dipole moment.$4$. Consequently, the resultant dipole moment of $NF_3$ $(0.24 \ D)$ is much smaller than that of $NH_3$.$5$. Therefore, the statement that the orbital dipole due to the lone pair is in the same direction as the resultant dipole moment of the three bonds is incorrect for $NF_3$.

Select the incorrect statement from the following.

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