The presence of which group of atoms makes a hydrocarbon aromatic?
a) Hydroxyl group
b) Carboxyl group
c) Benzene ring
d) Amino group
Answer: c) Benzene ring

Which of the following hydrocarbons is used as a solvent in dry cleaning?
a) Methane
b) Ethylene
c) Toluene
d) Butane
Answer: c) Toluene

Which reaction involves the addition of hydrogen to an alkene to form an alkane?
a) Hydrogenation
b) Dehydration
c) Polymerization
d) Halogenation
Answer: a) Hydrogenation

The name of the compound with the formula C₄H₈ is:
a) Butyne
b) Butane
c) Butylene
d) Butadiene
Answer: c) Butylene

Which of the following is a characteristic of alkenes?
a) They have a general formula CₙH₂ₙ₊₂
b) They contain one or more double bonds
c) They are saturated hydrocarbons
d) They have single bonds between carbon atoms
Answer: b) They contain one or more double bonds

Which of the following compounds is used as a starting material for the synthesis of polystyrene?
a) Methane
b) Ethylene
c) Styrene
d) Butylene
Answer: c) Styrene

The process of forming larger hydrocarbons from smaller ones is called:
a) Cracking
b) Polymerization
c) Hydrogenation
d) Halogenation
Answer: b) Polymerization

Which of the following is not a characteristic of alkynes?
a) They contain triple bonds
b) They have the general formula CₙH₂ₙ₋₂
c) They are highly reactive
d) They are used in the manufacture of polymers
Answer: d) They are used in the manufacture of polymers

Which of the following hydrocarbons is used in the production of synthetic rubber?
a) Butadiene
b) Methane
c) Ethylene
d) Propylene
Answer: a) Butadiene

The process of converting ethylene into polyethylene involves:
a) Hydrogenation
b) Cracking
c) Polymerization
d) Halogenation
Answer: c) Polymerization