Which of the following molecular interactions include not only London dispersion forces but also dipole-dipole interaction?

{P F}_{3} (l)

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{B F}_{3} (l)

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L a F_{3} (l)

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S i F_{4} (l)

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Solution

The correct option is A ${P F}_{3} (l)$
In case of $P F_{3}$ due to the lack of symmetry not only London dispersion force occurs but also dipole-dipole interactions takes place and in P orbitals there is alone pair of electrons and dipoles do not cancels with each other.

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N H_{3}

and

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Match the following:

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