Which statement describes an alkyne?

Which statement describes an alkyne?

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

Answer: (D)

Alkynes are hydrocarbons that contain a carbon–carbon triple bond. That bond is written as C≡C, meaning three bonds between the same two carbons (one sigma and two pi bonds). This triple bond also makes the connected carbons sp hybridized and gives the molecule a linear shape. So the defining description is a carbon–carbon triple bond. The other descriptions point to different functional features: a C=C is a double bond (alkenes), C–O–C describes ethers, and C≡N describes nitriles. A classic example of an alkyne is ethyne, HC≡CH, which shows the characteristic triple bond.

Alkynes are hydrocarbons that contain a carbon–carbon triple bond. That bond is written as C≡C, meaning three bonds between the same two carbons (one sigma and two pi bonds). This triple bond also makes the connected carbons sp hybridized and gives the molecule a linear shape. So the defining description is a carbon–carbon triple bond. The other descriptions point to different functional features: a C=C is a double bond (alkenes), C–O–C describes ethers, and C≡N describes nitriles. A classic example of an alkyne is ethyne, HC≡CH, which shows the characteristic triple bond.