Alkene MCQs

41. What is the IUPAC name of CH₃CH₂CH=CH₂?

• A) 1-Butene
• B) 2-Butene
• C) Butane
• D) Propene
• Answer: A

42. Which catalyst is used in the hydrogenation of alkenes?

• A) Palladium
• B) Nickel
• C) Platinum
• D) All of the above
• Answer: D

43. What is the result of the oxidation of alkenes with potassium permanganate?

• A) Alcohols
• B) Carboxylic acids
• C) Ketones
• D) Diols
• Answer: D

44. Which of the following describes cis and trans isomerism in alkenes?

• A) Positional isomerism
• B) Optical isomerism
• C) Geometric isomerism
• D) Functional group isomerism
• Answer: C

45. The reaction of alkenes with halogens such as bromine results in:

• A) Substitution reaction
• B) Addition reaction
• C) Elimination reaction
• D) Rearrangement reaction
• Answer: B

46. Which of the following alkenes cannot exist as geometric isomers?

• A) 2-Butene
• B) 1-Butene
• C) 3-Hexene
• D) 2-Pentene
• Answer: B

47. The alkene that shows the highest reactivity in electrophilic addition is:

• A) Ethene
• B) Propene
• C) Butene
• D) Pentene
• Answer: A

48. Which of the following is an environmental benefit of producing polymers from alkenes?

• A) Biodegradability
• B) Renewable raw materials
• C) Recycling potential
• D) Reduction in carbon emissions
• Answer: C

49. Which reaction of alkenes forms alcohols in the presence of an acid catalyst?

• A) Hydration
• B) Dehydration
• C) Halogenation
• D) Polymerization
• Answer: A

50. Which method is used to determine the degree of unsaturation in alkenes?

• A) Bromine test
• B) Lucas test
• C) Iodoform test
• D) Tollen’s test
• Answer: A