Aromatic Compounds Quiz - CBSE Class 12 Chemistry
Free practice quiz: Aromatic Compounds (CBSE Class 12 Chemistry). 18 multiple-choice questions with answers and explanations. Play online, no sign-up needed.
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Which of the following compounds is an aromatic hydrocarbon?
- Cyclohexane
- Benzene
- Cyclopentene
- Ethanol
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Answer: B. Benzene
Benzene is an aromatic compound known for its stability due to resonance. Cyclohexane is aliphatic, cyclopentene is unsaturated, and ethanol is an alcohol.
What type of hybridization is exhibited by the carbon atoms in benzene?
- sp2
- sp
- sp3
- d2sp3
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Answer: A. sp2
In benzene, each carbon atom undergoes sp2 hybridization, which allows for the formation of planar ring structure and delocalized π-electron cloud.
In which reaction does benzene react with concentrated sulfuric acid?
- Sulfonation
- Nitration
- Hydrogenation
- Halogenation
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Answer: A. Sulfonation
Benzene reacts with concentrated sulfuric acid for sulfonation, forming benzene sulfonic acid as the product.
What is the effect of substituents like -NO2 and -COOH on the electrophilic substitution reactions of aromatic compounds?
- Activating
- Deactivating
- Neutral
- Only ortho-para directing
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Answer: B. Deactivating
Substituents such as -NO2 and -COOH are deactivating groups due to their electron-withdrawing nature, lowering the reactivity of the aromatic compound.
What is the main reason for the stabilities of aromatic compounds?
- Presence of double bonds
- Hyperconjugation
- Resonance energy
- They are aliphatic
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Answer: C. Resonance energy
The stability of aromatic compounds comes from their resonance energy, which is the energy released due to delocalized π-electrons across the cyclic structure.