Class 12 Chemistry · Chapter 4 · Test 1
Benzene Structure and Stability
46 MCQs
46 questions · 40 min · 46 marks
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Sample questions
The first 5 of 46. Try each one, then tap to see the answer.
Question 1
What is the molecular formula of benzene?
- AC6H12
- BC6H6
- CC6H14
- DC5H6
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Answer: B
Benzene is C6H6, the simplest aromatic hydrocarbon.
Question 2
Organic hydrocarbons containing one or more benzene rings are known as:
- AAlkenes
- BAlkynes
- CAlicyclics
- DArenes
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Answer: D
Hydrocarbons containing benzene rings are called arenes.
Question 3
Compounds with benzene rings were first called aromatic because many of them were:
- ASweet smelling
- BColourless
- CExplosive
- DInsoluble in water
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Answer: A
Benzene-derived products are often pleasantly fragrant so early scientists called them aromatic (sweet smelling).
Question 4
Which statement about the term aromatic today is correct?
- AIt is used only for good-smelling compounds
- BIt designates molecules with benzene or benzene-like rings even if they smell foul
- CIt is used for all cyclic compounds
- DIt is used only for alkenes
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Answer: B
The term continues to be used for compounds with benzene and benzene-like rings whether or not they smell pleasant.
Question 5
Camphor has a strong minty aroma but is not an aromatic compound because it:
- AIs a gas
- BContains a nitro group
- CLacks a benzene ring in its structure
- DHas no carbon atoms
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Answer: C
Non-aromatic compounds such as camphor can smell strongly but have no benzene ring.
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