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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: NO3− > NO2− > N2O4 > NO

Solution

The bond length depends on the bond order. NO3− has the lowest bond order, followed by NO2−, N2O4, and NO, which has the highest bond order. Hence, the bond length decreases in this order.

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