Question

Consider the following statements:
(A) NF3 molecule has a trigonal planar structure. 
(B) Bond length of N2 is shorter than O2. 
(C) Isoelectronic molecules or ions have identical bond order. 
(D) Dipole moment of H2S is higher than that of water molecule. 
Choose the correct answer from the option below

• (A) and (D) are correct
• (B) and (C) are correct
• (A) and (B) are correct
• (C) and (D) are correct

Hint:

Isoelectronic species have the same number of electrons and bond orders

Answer 1

The Correct Option is B

Statement Analysis: 

• (A): Incorrect—NF₃ has a trigonal pyramidal structure due to the lone pair on the nitrogen atom, not a planar structure.
• (B): Correct—N₂ has a triple bond, resulting in a shorter bond length compared to O₂, which has a double bond.
• (C): Correct—Isoelectronic species such as O₂⁻, F⁻, and N₂ have identical bond orders because they share the same number of electrons and similar electronic configurations.
• (D): Incorrect—Water (H₂O) has a higher dipole moment due to the bent geometry and the high electronegativity of oxygen, whereas NF₃ has a lower dipole moment due to the partial cancellation of dipoles in its pyramidal structure.

Conclusion:

Correct Statements: (B) and (C).

Incorrect Statements: (A) and (D).