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(i) As the number of lone pair of electrons increases, bond angle decreases due to repulsion between lp – lp. (ii) As the electronegativity of the central atom increases, bond angle increases. Hence, the correct order of bond angle:

1. :Cl: O O < :O: Cl Cl < :Cl: O O
2. two lone pairs two lone pairs one lone pair and one electron
3. two lone pairs two lone pairs one lone pair and one electron
4. two lone pairs two lone pairs one lone pair and one electron

Correct answer: :Cl: O O < :O: Cl Cl < :Cl: O O

Solution

The bond angle decreases with an increase in lone pair-lone pair repulsion, and increases with the electronegativity of the central atom. The given order aligns with these principles.

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