31. Which of the following is a structural isomer of butane?

• A) 2-Butene
• B) Isobutane
• C) Cyclobutane
• D) Propane
• Answer: B

32. Which alkane is commonly used as a fuel in lighters?

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

33. What happens when an alkane undergoes cracking?

• A) It breaks down into smaller alkanes and alkenes
• B) It undergoes polymerization
• C) It forms larger molecules
• D) It reacts with water
• Answer: A

34. The complete combustion of alkanes produces:

• A) Carbon monoxide and water
• B) Carbon dioxide and water
• C) Methane and hydrogen
• D) Nitrogen oxides
• Answer: B

35. Which type of bond is present between carbon atoms in alkanes?

• A) Double bond
• B) Triple bond
• C) Single bond
• D) Ionic bond
• Answer: C

36. Which reaction can be used to synthesize alkanes from alkyl halides?

• A) Wurtz reaction
• B) Oxidation
• C) Dehydrogenation
• D) Ozonolysis
• Answer: A

37. Alkanes burn in oxygen to produce carbon dioxide and:

• A) Carbon monoxide
• B) Nitrogen
• C) Water
• D) Hydrogen
• Answer: C

38. Which of the following is a branched alkane?

• A) n-Pentane
• B) Cyclopentane
• C) Isopentane
• D) Ethane
• Answer: C

39. What is the IUPAC name of CH₃CH₂CH₂CH₃?

• A) Butane
• B) Propane
• C) Pentane
• D) Hexane
• Answer: A

40. The first four members of the alkane series are:

• A) Gases
• B) Liquids
• C) Solids
• D) Polymers
• Answer: A