Question

what are alkenes?
alkenes are hydrocarbons that contain only two carbon atoms.
alkenes are hydrocarbons that contain at least two double bonds between carbon atoms.
alkenes are hydrocarbons that cant contain double bonds between carbon atoms.
alkenes are hydrocarbons that contain at least one double bond between carbon atoms.
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part b
how are they different from alkanes?
alkenes are hydrocarbons that contain only two carbon atoms when alkanes should contain more than two carbons.
alkenes are hydrocarbons that cant contain double bonds between carbon atoms when alkanes should contain at le
alkenes are hydrocarbons that contain at least one double bond between carbon atoms when alkanes should not ha
alkenes are hydrocarbons that cant contain double bonds between carbon atoms when alkanes should contain at le

Explanation:

Alkenes are defined as hydrocarbons with at least one carbon - carbon double bond. Alkanes, on the other hand, have only single bonds between carbon atoms.

• For the first question:
• The first option is wrong because alkenes can have more than two carbon atoms (e.g., propene \(C_3H_6\)).
• The second option is wrong as alkenes have at least one double bond, not two.
• The third option is wrong since alkenes do have double bonds.
• The fourth option is correct as it aligns with the definition of alkenes.
• For the second question:
• The first option is wrong as alkenes can have more than two carbon atoms and alkanes can have two or more carbon atoms (e.g., ethane \(C_2H_6\)).
• The second option is wrong because alkenes have double bonds.
• The third option is correct as it correctly differentiates alkenes (with double bonds) from alkanes (without double bonds).
• The fourth option is wrong as it misrepresents the bonding in alkenes.

Answer:

First question: Alkenes are hydrocarbons that contain at least one double bond between carbon atoms.
Second question: Alkenes are hydrocarbons that contain at least one double bond between carbon atoms when alkanes should not have double bonds.