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The cylindrical shape of an alkyne is due to the fact that it has

1. three sigma C–C bonds
2. two sigma C–C and one π C–C bond
3. three π C–C bonds
4. one sigma C–C and two π C–C bonds

Correct answer: one sigma C–C and two π C–C bonds

Solution

The cylindrical shape of an alkyne arises from the linear geometry around the carbon-carbon triple bond, which consists of one sigma bond and two π bonds. This arrangement ensures the bond angles are 180°.

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