Dipole moment of NF3 is smaller than:

Both the molecules have a pyramidal shape with a lone pair of electrons on the nitrogen atom.Although fluorine is more electronegative than nitrogen, the resultant dipole moment of NH3 (4.90×10−30 CM) is greater than that of NF3 (0.8×10−30 Cm).This is because in case of NH3 the orbital dipole due to lone pair is in the same direction as the resultant dipole moment of the N - H bonds.Whereas in NF3 the orbital dipole is in the direction opposite to the resultant dipole moment of the three N - F bonds. The orbital dipole because of the lone pair decreases the effect of the resultant N - F bond moments, which results in the low dipole moment of NF3.

Dipole moment of NF3 is smaller than:

Both the molecules have a pyramidal shape with a lone pair of electrons on the nitrogen atom.Although fluorine is more electronegative than nitrogen, the resultant dipole moment of NH3 (4.90×10−30 CM) is greater than that of NF3 (0.8×10−30 Cm).This is because in case of NH3 the orbital dipole due to lone pair is in the same direction as the resultant dipole moment of the N - H bonds.Whereas in NF3 the orbital dipole is in the direction opposite to the resultant dipole moment of the three N - F bonds. The orbital dipole because of the lone pair decreases the effect of the resultant N - F bond moments, which results in the low dipole moment of NF3.

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Dipole moment of NF₃ is smaller than:

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NH₃

CO₂

BF₃

CCl₄

answer is A.

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Detailed Solution

Both the molecules have a pyramidal shape with a lone pair of electrons on the nitrogen atom.
Although fluorine is more electronegative than nitrogen, the resultant dipole moment of NH3 (4.90×10⁻³⁰ CM) is greater than that of NF3 (0.8×10⁻³⁰ Cm).
This is because in case of NH₃ the orbital dipole due to lone pair is in the same direction as the resultant dipole moment of the N - H bonds.
Whereas in NF₃ the orbital dipole is in the direction opposite to the resultant dipole moment of the three N - F bonds. The orbital dipole because of the lone pair decreases the effect of the resultant N - F bond moments, which results in the low dipole moment of NF₃.