Question

____ are compounds made up of only the elements carbon and hydrogen, where they have only single bonds and no functional groups.
○ alkenes
○ alkanes
○ alkyl halides
○ carbohydrates

Explanation:

To solve this, we analyze each option:

• Alkenes have at least one double bond (not single bonds only), so eliminate.
• Alkanes are hydrocarbons with only single bonds between carbon atoms and consist of C and H, matching the description.
• Alkyl halides contain halogens (not just C and H), so eliminate.
• Carbohydrates have C, H, O (not just C and H), so eliminate.

Answer:

B. Alkanes