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Chemical Bonding and Molecular Structure — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryChemical Bonding and Molecular Structure3 Marks
Question
In both water and dimethyl ether oxygen atom is central atom, and has the same hybridisation, yet they have different bond angles. Which one has greater bond angle? Give reason.
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Answer

Dimethyl ether will have larger bond angle. There will be more repulsion between bond pairs of $\mathrm{CH}_3$ groups attached in ether than between bond pairs of hydrogen atoms attached to oxygen in water. The carbon of $\mathrm{CH}_3$ in ether is attached to three hydrogen atoms through $\sigma$ bonds and electron pairs of these bonds add to the electronic charge density on carbon atom. Hence, repulsion between two $-\mathrm{CH}_3$ groups will be more than that between two hydrogen atoms.

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