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  4. Which of the following has smallest bond angle?

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Q. Which of the following has smallest bond angle?

Jharkhand CECEJharkhand CECE 2006

Solution:

The bond length of
Ethane $C-C$ is $ 1.54\,sp^{3}-sp^{3} $
Ethene $ C=C $ is $ 1.34\,sp^{2}-sp^{2} $
Ethyne $ C\equiv C $ is $ 1.20\,sp-sp $
Ethanol $C-O$ is $ 1.42\,sp^{3}-sp $
So, the smallest bond angle is of ethyne.