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The correct order of N—O bond lengths in NO, NO2−, NO3− and N2O4 is:

1. N2O4 > NO2− > NO3− > NO
2. NO > NO3− > N2O4 > NO2−
3. NO3− > NO2− > N2O4 > NO
4. NO > N2O4 > NO2− > NO3−

Correct answer: NO > N2O4 > NO2− > NO3−

Solution

The bond length increases as the oxidation state of nitrogen decreases.

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