• # question_answer Which of the following molecules has the maximum dipole moment? A) $C{{O}_{2}}$ B) $C{{H}_{4}}$     C) $N{{H}_{3}}$ D) $N{{F}_{3}}$

Correct Answer: C

Solution :

 $C{{O}_{2}}$ and $C{{H}_{4}}$ have zero dipole moment as these are symmetrical in nature. Between $N{{H}_{3}}$ and $N{{F}_{3}}$, $N{{H}_{3}}$ has greater dipole moment, though in $N{{H}_{3}}$ and $N{{F}_{3}}$ both, N possesses one lone pair of electrons. This is because in case of $N{{H}_{3}}$ the net $N-H$ bond dipole is in the same direction as the direction of dipole of lone pair, but in case ofNF3, the direction of net bond dipole moment of three $-N-F$ bonds is opposite to that of the dipole moment of the lone pair. [a] [b] [c] [d]

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