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  4. Which one of the following has the smallest bond angle ?

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Q. Which one of the following has the smallest bond angle ?

KEAMKEAM 2003Chemical Bonding and Molecular Structure

Solution:

Hybridisation involved in $NH_3$ is $sp^3$ with one lone pair, in $BeF_2$ is $sp^2$ with no lone pair, in $H_2O$ is $sp^3$ with two lone pairs, in $CH_4$ is $sp^3$ with no lone pair, in $S O_2$ is $sp^1$ with one lone pair. Therefore, least bond angle is $H_2O$ (= 104-5$^\circ$).