The molecule having three folds of axis of symmetry is:

{N H}_{3}

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P {C l}_{5}

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{S O}_{2}

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{C O}_{2}

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Solution

The correct option is D ${N H}_{3}$
$N H_{3}$ has pyramidal shape and thus, possesses three folds axis of symmetry.
In symmetry of $N H_{3}$ , the nitrogen atom remains fixed but the hydrogen atoms can be permuted in $3! = 6$ different ways. The axis of the molecule is called a $C_{3}$ axis, since the molecule can be rotated about it into 3 equivalent orientations.

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Which of the following molecules has three-fold axis of symmetry

[UPSEAT 2004]

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{B F}_{3}, {C O}_{2}, {S O}_{2}, {P C I}_{5}, {C I F}_{3}, {N H}_{3}, {C H}_{4}

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