Which suffix indicates one carbon–carbon double bond?

Which suffix indicates one carbon–carbon double bond?

• A. An
• B. En
• C. Diene
• D. Yne

Answer: (B)

The concept being tested is how the ending of a hydrocarbon name signals the type and number of carbon–carbon bonds. In naming, single bonds use the ending -ane, a single carbon–carbon double bond is indicated by -ene, two double bonds by -diene, and a triple bond by -yne. So a molecule with one C=C bond is called something-ene (for example, ethene, propene). The option that corresponds to the presence of a C=C bond is En, which represents the -ene ending.

The concept being tested is how the ending of a hydrocarbon name signals the type and number of carbon–carbon bonds. In naming, single bonds use the ending -ane, a single carbon–carbon double bond is indicated by -ene, two double bonds by -diene, and a triple bond by -yne. So a molecule with one C=C bond is called something-ene (for example, ethene, propene). The option that corresponds to the presence of a C=C bond is En, which represents the -ene ending.