In both water and dimethyl ether (CH_{3} - \ddot{O}- CH_{3}), oxygen atom is central atom, and has the same hybridization, yet they have different bond angles. Which one has greater bond angle? Give reason.

Answers (1)

Because of more repulsion between bond pairs of CH_{3} groups attached in ether than between bond pair of hydrogen atoms attached to oxygen in the water. Dimethyl ether will have a larger bond angle. The carbon of CH_{3} in ether is attached to three hydrogen atoms through bonds, and electron pairs of these bonds add to the electronic charge density on the carbon atom. Hence, the repulsion between two -CH_{3} groups will be more than that between two hydrogen atoms.

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