Question

Which of the following shows correct order of bond length?

• A. O₂⁺ > O₂ > O₂⁻ > O₂²-
• B. O₂⁺ < O₂ < O₂⁻ < O₂²-
• C. O₂⁺ < O₂⁻ < O₂ < O₂²-
• D. O₂⁺ > O₂ < O₂⁻ > O₂²-

Hint:

Higher bond order ⟹ shorter bond length.

Answer 1

The Correct Option is B

Step 1: Bond order decreases as electrons are added to antibonding orbitals. Bond order: O₂⁺ (2.5) > O₂ (2) > O₂⁻ (1.5) > O₂²- (1) Step 2: Bond length is inversely proportional to bond order. ⟹ Shortest → Longest O₂⁺ < O₂ < O₂⁻ < O₂²-