Question

A pair of isoelectric species having bond order of one is:

• A. N₂, CO
• B. N₂, NO⁺
• C. O₂^2-, F₂
• D. CO, NO⁺

Answer 1

The Correct Option is C

The question asks to identify the pair of isoelectric species having a bond order of one.

Explanation of each option:

• (A) \( N_2 \), CO: These species are isoelectronic (both have 14 electrons), but their bond orders are not equal to 1. The bond order of \( N_2 \) is 3, and for CO, it is also 3.
• (B) \( N_2 \), \( NO^+ \): These species are isoelectronic, but their bond orders differ. The bond order of \( N_2 \) is 3, while \( NO^+ \) has a bond order of 2.
• (C) \( O_2^{2-} \), \( F^- \): These species are isoelectronic (both have 16 electrons), and both have a bond order of 1, making this the correct answer.
• (D) CO, \( NO^+ \): These species are isoelectronic, but their bond orders differ. CO has a bond order of 3, while \( NO^+ \) has a bond order of 2.

The correct answer is (C) \( O_2^{2-} \), \( F^- \), as these are isoelectronic species with a bond order of 1.

Answer 2

Isoelectronic species are those species that have the same number of electrons. The bond order can be calculated using the molecular orbital theory.

For O₂²⁻ and F₂, both are isoelectronic, and they both have a bond order of one, making them the correct pair for this question.