Which statement correctly describes alkanes and alkenes?

• A. Alkanes contain only single bonds; alkenes contain double bonds
• B. Alkanes contain double bonds; alkenes contain triple bonds
• C. Both have only single bonds
• D. Alkanes contain benzene rings

Answer: (A)

The main idea here is how carbon–carbon bonds differ between these two families. Alkanes are saturated hydrocarbons, meaning all C–C bonds are single bonds. Alkenes are unsaturated hydrocarbons that contain at least one carbon–carbon double bond. The statement reflects this difference directly, making it the best description.

The other options don’t fit: alkane structures do not have double bonds, so that part is false; alkenes do not have triple bonds, so that’s incorrect; both having only single bonds ignores the double bond in alkenes; and alkanes do not contain benzene rings, which are features of aromatic compounds.