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Arrange the following species in the order of increasing bond angle: ClO2, Cl2O, ClO2−

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

Correct answer: ClO2 < Cl2O < ClO2−

Solution

The bond angles increase due to the presence of lone pairs and the molecular geometry. ClO2 has a bent shape with two lone pairs, resulting in a smaller bond angle. Cl2O has a larger bond angle due to fewer lone pairs, while ClO2−, being a resonance structure with a trigonal pyramidal shape, has the largest bond angle.

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