The order of increasing X-Se-X bond angle is; SeCl6 < SeF2< SeO2.
According to Valence Shell electron pair repulsion theory, the shapes of molecules depend on the number of electron pairs on the valence shell of the molecule.
Also, the expected bond angle in molecules naturally arises from the shape of the molecule. In the molecules listed;
- SeCl6 has no lone pairs and a bond angle of exactly 90°.
- SeO2 has one lone pair. Its X-Se-X bond angle is slightly less than 120°.
- SeF2 has two lone pairs and an X-Se-X bond angle less than 109°.
Hence, the order of increasing X-Se-X bond angle is; SeCl6 < SeF2< SeO2
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Place the following in order of increasing X-Se-X bond angle, where X represents the outer atoms in each molecule. SeO2 SeCl6 SeF2
