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The correct order of C–O bond length among CO, CO3−2, CO2 is:

1. CO < CO3−2 < CO2
2. CO2 < CO3−2 < CO
3. CO3−2 < CO2 < CO
4. CO2 < CO < CO3−2

Correct answer: CO < CO3−2 < CO2

Solution

The bond length is inversely proportional to bond order. CO has the highest bond order (triple bond), followed by CO2 (double bond), and CO3−2 (resonance structure with partial double bonds), making the order CO < CO3−2 < CO2.

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