Unit 8: Aliphatic Hydrocarbons

31. The most common reaction type for alkanes is:

a) Addition reaction
b) Substitution reaction
c) Elimination reaction
d) Condensation reaction
Answer: b) Substitution reaction

32. The process of converting unsaturated hydrocarbons to saturated hydrocarbons is called:

a) Hydrogenation
b) Halogenation
c) Dehydration
d) Cracking
Answer: a) Hydrogenation

33. The compound that contains a triple bond is called:

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

34. In a cycloalkane, the carbon atoms are bonded in:

a) A linear chain
b) A branched chain
c) A ring structure
d) A planar structure
Answer: c) A ring structure

35. The boiling point of alkanes generally increases with:

a) Decreasing molecular weight
b) Increasing branching
c) Increasing molecular weight
d) Decreasing carbon chain length
Answer: c) Increasing molecular weight

36. The reaction of alkanes with chlorine in the presence of sunlight is called:

a) Substitution
b) Addition
c) Hydrogenation
d) Dehydration
Answer: a) Substitution

37. The formula for butene is:

a) C₄H₈
b) C₄H₁₀
c) C₄H₆
d) C₅H₁₀
Answer: a) C₄H₈

38. The simplest cycloalkane is:

a) Cyclopropane
b) Cyclobutane
c) Cyclopentane
d) Cyclohexane
Answer: a) Cyclopropane

39. The process used to obtain ethylene from ethane is:

a) Dehydrogenation
b) Hydrogenation
c) Halogenation
d) Polymerization
Answer: a) Dehydrogenation

40. The reaction of an alkene with a halogen results in the formation of:

a) Haloalkanes
b) Alkanes
c) Alcohols
d) Carboxylic acids
Answer: a) Haloalkanes