2-hexene is best described as which type of compound?

2-hexene is best described as which type of compound?

• A. A saturated aliphatic hydrocarbon
• B. An unsaturated hydrocarbon with a carbon-carbon double bond
• C. An aromatic ring compound
• D. An alcohol

Answer: (B)

The defining idea is that the presence of a carbon–carbon double bond places a hydrocarbon in the alkene family, which are unsaturated because they have fewer hydrogens than the corresponding alkanes. 2-hexene has a C=C bond in its carbon chain, so it’s an alkene and thus an unsaturated hydrocarbon with a carbon–carbon double bond. It isn’t an aromatic ring compound, since it doesn’t contain a conjugated cyclic ring like benzene, and it isn’t an alcohol because it has no hydroxyl group. So the best description is that it is an unsaturated hydrocarbon with a carbon–carbon double bond.

The defining idea is that the presence of a carbon–carbon double bond places a hydrocarbon in the alkene family, which are unsaturated because they have fewer hydrogens than the corresponding alkanes. 2-hexene has a C=C bond in its carbon chain, so it’s an alkene and thus an unsaturated hydrocarbon with a carbon–carbon double bond. It isn’t an aromatic ring compound, since it doesn’t contain a conjugated cyclic ring like benzene, and it isn’t an alcohol because it has no hydroxyl group. So the best description is that it is an unsaturated hydrocarbon with a carbon–carbon double bond.