Ncert Exercises & Solutions

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.

Dimethyl ether has greater bond angle than that of water, however in both the molecules central atom is sp³ hybridised with two lone pairs. In dimethyl ether, bond angle is greater

(111.7 °)

due to the greater repulsive interaction between the two bulky alkyl (methyl) groups than that between two H-atoms.

Actually C of CH₃ group is attached to three H-atoms through

σ

-bonds. These three C-H bond pair of electrons increases the electronic charge density on carbon atom.

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