JEE MainChemistryChemical Bonding and Molecular Structure
Consider the following statements: (A) The dipole moment of NH ₃ is greater than that of NF ₃ . (B) Both O ₂ and B ₂ are paramagnetic molecules according to Molecular Orbital Theory. (C) The shape of SF ₄ is square planar. (D) CO and NO ^+ are isoelectronic but have different bond orders. Choose the correct answer from the options given below:
Options
- A(A) and (B) only
- B(A) and (C) only
- C(B) and (D) only
- D(C) and (D) only
Correct answer
A. (A) and (B) only
Step-by-step solution
In NH ₃ , the orbital dipole due to the lone pair is in the same direction as the resultant dipole moment of the N-H bonds, whereas in NF ₃ , the orbital dipole is in the opposite direction to the resultant dipole moment of the N-F bonds. Thus, the dipole moment of NH ₃ is greater than that of NF ₃ . Statement (A) is correct. According to Molecular Orbital Theory, O ₂ has two unpaired electrons in its ^ * antibonding orbitals, and B ₂ has two unpaired electrons in its bonding orbitals. Both are paramagnetic. Statem