Alkene MCQs

11. Alkenes are hydrocarbons that contain:

• A) Single bonds only
• B) Double bonds only
• C) One or more double bonds
• D) One or more triple bonds
• Answer: C

12. The general formula of alkenes is:

• A) CnH₂n₋₂
• B) CnH₂n₊₂
• C) CnH₂n₊₄
• D) CnH₂n
• Answer: D

13. The simplest alkene is:

• A) Ethane
• B) Methane
• C) Ethene
• D) Propene
• Answer: C

14. Which of the following is the IUPAC name for ethylene?

• A) Ethene
• B) Ethane
• C) Propyne
• D) Ethyne
• Answer: A

15. Alkenes exhibit what type of hybridization at the double-bonded carbons?

• A) sp
• B) sp²
• C) sp³
• D) sp³d
• Answer: B

16. The bond angles in alkenes are approximately:

• A) 180°
• B) 109.5°
• C) 120°
• D) 90°
• Answer: C

17. Which of the following is an example of an alkene?

• A) Methane
• B) Propane
• C) Ethylene
• D) Ethyne
• Answer: C

18. Which of the following reactions is characteristic of alkenes?

• A) Addition reactions
• B) Substitution reactions
• C) Condensation reactions
• D) Elimination reactions
• Answer: A

19. What is the product of the complete hydrogenation of alkenes?

• A) Alkynes
• B) Alkanes
• C) Aldehydes
• D) Carboxylic acids
• Answer: B

20. What is the IUPAC name for CH₃CH=CH₂?

• A) Propene
• B) Propane
• C) Propyne
• D) Butene
• Answer: A