Which of the following molecules is polar?

B C l_{3}

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C H_{4}

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P C l_{2} F_{3}

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P C l_{3} F_{2}

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Solution

The correct option is C $P C l_{2} F_{3}$
$P C l_{2} F_{3}$ has a trigonal bipyramidal structure, where two chlorine atoms are present at equitorial positions. Dipole moment along the axial direction gets cancelled due to the presence of similar atoms. A net dipole moment arises along the equitorial plane due to the presence of atoms with different electronegativities.

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