Which one of the following is least volatile?

H C N

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H F

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H_{2} O

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C S_{2}

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Solution

The correct option is C $H_{2} O$
$H_{2} O$ is least volatile due to strong H-bonding.

It forms $2$ hydrogen bonds. $H F$ is also not much volatile but it forms only one hydrogen bond.

Rest of the compounds are volatile since they do not have any hydrogen bonding.

Hence the correct option is C.

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