Alkane MCQs

11. Alkanes are also known as:

• A) Unsaturated hydrocarbons
• B) Saturated hydrocarbons
• C) Aromatic hydrocarbons
• D) Alkenes
• Answer: B

12. The general formula for alkanes is:

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

13. Which of the following is the simplest alkane?

• A) Ethane
• B) Methane
• C) Propane
• D) Butane
• Answer: B

14. What type of hybridization is present in alkanes?

• A) sp
• B) sp²
• C) sp³
• D) dsp²
• Answer: C

15. The carbon-carbon bonds in alkanes are:

• A) σ-bonds
• B) π-bonds
• C) Ionic bonds
• D) Double bonds
• Answer: A

16. Alkanes undergo which type of reactions predominantly?

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

17. Which of the following is an alkane?

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

18. What is the IUPAC name of C₃H₈?

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

19. The boiling points of alkanes increase with:

• A) Decrease in molecular size
• B) Increase in molecular size
• C) Decrease in chain length
• D) Increase in branching
• Answer: B

20. Alkanes are commonly obtained from:

• A) Coal
• B) Petroleum and natural gas
• C) Biomass
• D) Wood
• Answer: B