Which pair of molecules has the strongest dipole–dipole interaction?

N H_{3}

and

N H_{3}

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C H_{4}

and

C H_{4}

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C O_{2}

and

C O_{2}

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N H_{3}

and

C H_{4}

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Solution

The correct option is A $N H_{3}$ and $N H_{3}$
$N H_{3}$ molecules have the strongest dipole–dipole interactions since it is polar and intermolecular H-bonding is also present.

In $C H_{4}$ and $C O_{2}$ , there are no dipole interactions possible, since the molecules are non-polar the net dipole moment is zero.

In $C H_{4}$ and $N H_{3}$ , dipole-induced dipole interactions are present which is weaker than H-Bonding.

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