Unit 9: Aromatic Hydrocarbons

21. The “meta” position in an aromatic ring describes:

a) The 1,3-positions
b) The 1,4-positions
c) The 1,2-positions
d) The 1,5-positions
Answer: a) The 1,3-positions

22. The “para” position in an aromatic ring describes:

a) The 1,3-positions
b) The 1,4-positions
c) The 1,2-positions
d) The 1,5-positions
Answer: b) The 1,4-positions

23. The process of hydrogenating benzene involves:

a) Addition of hydrogen to the ring
b) Replacement of hydrogen with a halogen
c) Formation of an aromatic ring from a cyclohexane
d) Addition of a nitro group to the ring
Answer: a) Addition of hydrogen to the ring

24. Phenol contains which functional group?

a) Hydroxyl group
b) Carbonyl group
c) Carboxyl group
d) Amino group
Answer: a) Hydroxyl group

25. Which of the following compounds is known as carbolic acid?

a) Methanol
b) Ethanol
c) Phenol
d) Acetic acid
Answer: c) Phenol

26. The reaction between phenol and bromine results in:

a) Bromobenzene
b) Bromophenol
c) Tribromophenol
d) Bromocyclohexane
Answer: c) Tribromophenol

27. The addition of a nitro group to benzene is known as:

a) Nitration
b) Sulfonation
c) Halogenation
d) Alkylation
Answer: a) Nitration

28. The general formula for aromatic hydrocarbons is:

a) CₙH₂ₙ
b) CₙH₂ₙ₊₂
c) CₙH₂ₙ₋₂
d) CₙH₂ₙ
Answer: c) CₙH₂ₙ₋₂

29. In the reaction of benzene with chlorine in the presence of a catalyst, the product is:

a) Chlorobenzene
b) Benzyl chloride
c) Phenol
d) Benzaldehyde
Answer: a) Chlorobenzene

30. The compound toluene is also known as:

a) Methylbenzene
b) Ethylbenzene
c) Phenylmethane
d) Benzyl alcohol
Answer: a) Methylbenzene