Which option describes an alkyne?

Which option describes an alkyne?

• A. carbon-carbon triple bond
• B. C=C (double bond)
• C. C=O
• D. OH

Answer: (A)

An alkyne is defined by a carbon–carbon triple bond. That triple bond means the two carbons share three pairs of electrons, form one sigma bond and two pi bonds, and leads to linear geometry with the carbons typically sp hybridized. This is what sets alkynes apart from other unsaturated hydrocarbons. A C=C double bond describes alkenes, a C=O bond is a carbonyl group found in aldehydes and ketones, and an OH is a hydroxyl group found in alcohols. So the defining feature is the carbon–carbon triple bond.

An alkyne is defined by a carbon–carbon triple bond. That triple bond means the two carbons share three pairs of electrons, form one sigma bond and two pi bonds, and leads to linear geometry with the carbons typically sp hybridized. This is what sets alkynes apart from other unsaturated hydrocarbons. A C=C double bond describes alkenes, a C=O bond is a carbonyl group found in aldehydes and ketones, and an OH is a hydroxyl group found in alcohols. So the defining feature is the carbon–carbon triple bond.