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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 depends on the number of lone pairs and the repulsion between bonding and lone pairs. Cl2O has the smallest bond angle due to two lone pairs on oxygen, followed by ClO2−, and ClO2 has the largest bond angle due to fewer lone pair-bond pair repulsions.

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