Which of the following will have the least bond angle?

$C H_{4}$

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${N H}_{3}$

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$P H_{3}$

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$H_{2} O$

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Solution

The correct option is C
$P H_{3}$

$P H_{3}$ is a trigonal pyramidal molecule. The length of the $P - H$ bond is 1.42 Å and the $H - P - H$ bond angles are 93.5°, which is the least among the given compounds.

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Which has the least bond angle

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