Which of the following molecules has the maximum dipole moment?
(AIPMT 2014)

N F_{3}

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C O_{2}

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C H_{4}

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N H_{3}

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Solution

The correct option is D $N H_{3}$
$C O_{2}$ and $C H_{4}$ having zero dipole moment.

In $N H_{3}$ , the dipole is acting in single direction, but in $N F_{3}$ due to high electronegativity of $F$ -atom, the dipoles act in two opposite direction. Hence, the resultant dipole moment is higher for $N H_{3}$ .

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