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Predict the correct order of electron repulsion among the following:

1. lone pair−lone pair > lone pair−bond pair > bond pair−bond pair
2. lone pair−bond pair > bond pair−bond pair > lone pair−lone pair
3. bond pair−bond pair > lone pair−bond pair > lone pair−lone pair
4. lone pair−lone pair > bond pair−bond pair > lone pair−bond pair

Correct answer: lone pair−lone pair > lone pair−bond pair > bond pair−bond pair

Solution

Lone pairs occupy more space than bond pairs due to their higher electron density, leading to stronger repulsion. Thus, lone pair-lone pair repulsion is the strongest, followed by lone pair-bond pair, and then bond pair-bond pair.

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