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The correct order of increasing bond angles in the following species are:

1. Cl2O < ClO2 < ClO2−
2. ClO2− < Cl2O < ClO2
3. Cl2O < ClO2− < ClO2
4. ClO2− < ClO2 < Cl2O

Correct answer: Cl2O < ClO2− < ClO2

Solution

The bond angle increases with the number of lone pairs on the central atom. ClO2− has one lone pair, ClO2 has two lone pairs, and Cl2O has no lone pairs.

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