In ethyne, the two carbon atoms contain:

one sigma bond and two pi bonds

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one sigma bond and one pi bond

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two sigma bonds and one pi bond

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two sigma bonds and no pi bond

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Solution

The correct option is A one sigma bond and two pi bonds
The structure of ethyne: $H - C \equiv C - H$

The triple bond between two carbon atoms has one $σ$ bond and two $π$ bonds.

So, the correct option is $A$

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