The molecule having three fold axis of symmetry is:

N H_{3}

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C_{2} H_{4}

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C O_{2}

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S O_{2}

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Solution

The correct option is A $N H_{3}$
A molecule having rotational symmetry is the molecule which looks the same after rotation.
$n$ - fold symmetry means that the molecule when rotated by an angle of $\frac{360^{o}}{n}$ does not change it.
Hence, ammonia gas has three fold axis of symmetry.
The given figure shows the three fold axis.

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

[UPSEAT 2004]

X e O_{2} F_{2}

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X e O_{2} F_{4}

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m

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S O_{2}

N H_{3}

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C_{2} H_{4}

S F_{6}

C H_{2} C l_{2}

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