NEET2019ChemistryChemical Bonding and Molecular StructureActual
Which of the following is the correct order of dipole moment?
Options
- ANH ₃ < BF ₃ < NF ₃ < H ₂ O
- BBF ₃ < NF ₃ < NH ₃ < H ₂ O
- CBF ₃ < NH ₃ < NF ₃ < H ₂ O
- DH ₂ O < NF ₃ < NH ₃ < BF ₃
Correct answer
B. BF ₃ < NF ₃ < NH ₃ < H ₂ O
Step-by-step solution
BF ₃ has zero dipole moment as it is symmetrical in nature. H ₂ O has maximum dipole moment as it possess two lone pair of electrons. Between NH ₃ and NF ₃, NH ₃ has greater dipole moment though in NH ₃ and NF ₃ , both N possesses one lone pair of electrons. This is beacuse in case of NH ₃ , the net N - H bond dipole is in the same direction as the direction of dipole of lone pair. But in case of NF ₃ , the direction of net dipole moment of three - N - F bonds is opposite to that of the dipole moment of the lone pa