Unit 8: Aliphatic Hydrocarbons

51. The presence of a triple bond in alkynes makes them more reactive than:

a) Alkanes
b) Alkenes
c) Cycloalkanes
d) Aromatic hydrocarbons
Answer: b) Alkenes

52. The reaction of alkanes with oxygen results in the formation of:

a) Carbon dioxide and water
b) Carbon monoxide and water
c) Alkanols
d) Alkenes
Answer: a) Carbon dioxide and water

53. The common name for butane is:

a) Methane
b) Ethane
c) Propane
d) Butane
Answer: d) Butane

54. The primary use of alkenes in industry is for:

a) Fuel
b) Solvents
c) Polymer production
d) Fragrance
Answer: c) Polymer production

55. The type of isomerism that occurs in alkenes due to different spatial arrangements of groups around the double bond is:

a) Geometric isomerism
b) Structural isomerism
c) Optical isomerism
d) Functional group isomerism
Answer: a) Geometric isomerism

56. The compound with the formula C₅H₁₂ is an example of:

a) Alkene
b) Alkane
c) Alkyne
d) Aromatic hydrocarbon
Answer: b) Alkane

57. The reaction that converts ethylene to ethanol involves:

a) Hydrogenation
b) Hydration
c) Oxidation
d) Dehydrogenation
Answer: b) Hydration

58. The bond angle in an alkene is approximately:

a) 90°
b) 120°
c) 180°
d) 109.5°
Answer: b) 120°

59. The reaction used to test for the presence of alkenes involves:

a) Bromine water
b) Silver nitrate
c) Sodium hydroxide
d) Hydrochloric acid
Answer: a) Bromine water

60. The type of bond in an alkyne is:

a) Single
b) Double
c) Triple
d) Quadruple
Answer: c) Triple