NH3 has a net dipole moment, but boron trifluoride (BF3) has zero dipole moment, because:

The trigonal geometry of BF3 with three vectors (B → F) acting at 120o leads to zero dipole moment. In NH3 three vectors (N ← H) act at 107o along with one lone pair giving dipole moment in molecule.

NH3 has a net dipole moment, but boron trifluoride (BF3) has zero dipole moment, because:

The trigonal geometry of BF3 with three vectors (B → F) acting at 120o leads to zero dipole moment. In NH3 three vectors (N ← H) act at 107o along with one lone pair giving dipole moment in molecule.

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NH₃ has a net dipole moment, but boron trifluoride (BF₃) has zero dipole moment, because:

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B is less electronegative than N

F is more electronegative than H

BF₃ is pyramidal while NH₃ is planar

NH₃ is pyramidal while BF₃ is trigonal planar

answer is D.

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Detailed Solution

The trigonal geometry of BF₃ with three vectors (B → F) acting at 120^o leads to zero dipole moment. In NH₃ three vectors (N $\leftarrow$ H) act at 107^o along with one lone pair giving dipole moment in molecule.

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