NTA Abhyas NEET2020ChemistryChemical Bonding and Molecular StructurePractice
The dipole moments of the given species are such that
Options
- AB F 3 > N F 3 > N H 3
- BN F 3 > B F 3 > N H 3
- CN H 3 > N F 3 > B F 3
- DN H 3 > B F 3 > N F 3
Correct answer
C. N H 3 > N F 3 > B F 3
Step-by-step solution
The dipole moments of the given species are as follows N H 3 > N F 3 > B F 3 B F 3 is a planar molecule, so it has zero dipole moment. N H 3 has more dipole moment than N F 3 . The resultant dipole moment of three N - H bonds and dipole moment due to lone pair of electrons are acting in the same direction, but in case of N F 3 the resultant dipole moment of the three N - F bonds is acting opposite to the direction of dipole moment due to lone pair of electrons.