Ethyne is isoelectronic with:

chlorine

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oxygen

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nitrogen gas

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C O_{2}

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Solution

The correct option is C nitrogen gas
The number of electrons in ethyne( $C_{2} H_{2}$ ) molecule are 12 + 2 = 14 and the number of electrons in nitrogen( $N_{2}$ ) molecule are 7+7 =14. Thus ethyne and nitrogen molecules are isoelectronic with each other as they have same number of electrons.

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