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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.

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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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