In which of the following, intermolecular forces are the weakest?

C H_{3} C H_{2} O H

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N H_{3}

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H_{2} O

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C O_{2}

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Solution

The correct option is A $C O_{2}$
Among the given options $A, B$ and $C$ have inter molecular hydrogen bonding between them and hydrogen bond is a stronger force of attraction.
But in case of $C O_{2}$ has covalent bonds and dispersion forces. $C O_{2}$ is a linear molecule.
Hence, hydrogen bonding in $H_{2} O, N H_{3}, C H_{2} C H_{2} O H$ is a greater force than dispersion forces present in $C O_{2}$ .
Hence option $D$ is correct answer.

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