The carbon-carbon triple bond of an alkyne is composed of:

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Question: The carbon-carbon triple bond of an alkyne is composed of:

Option a: 'a. three σ bonds' — This is incorrect. A triple bond consists of one sigma bond plus two pi bonds; there are not three sigma bonds between the same two carbon atoms.

Option b: 'b. two σ bonds and one π bond' — This is incorrect. A triple bond uses only one sigma bond between the carbons; two additional bonds are pi bonds, not sigma.

Option c: 'c. one σ bond and two π bonds' — This is correct. In an alkyne, the C≡C bond comprises one sigma (σ) bond forming the end-to-end connectivity and two pi (π) bonds formed by side-to-side overlap of p orbitals above and below the bond axis, giving the characteristic linear geometry.

Option d: 'd. three π bonds' — This is incorrect. Pi bonds are not able to exist alone between the two carbon atoms in a triple bond; there must be a sigma bond for a stable overlap and to enable rotation restriction. A pure trio of pi bonds would not provide the required head-on overlap that sigma bonds offer for a strong bond.

Summary: The distinguishing feature of an alkyne is the presence of one sigma bond and two pi bonds between the carbon atoms, which explains the linear geometry and high bond strength compared to alkenes.

The carbon-carbon triple bond of an alkyne is composed of:单项选择题

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