Which is fused cyclic aromatic compound _____________________?
Correct answer: C. naphthalene
- A. diphenyl amine
- B. diphenyl methane
- C. naphthalene
- D. biphenyl
Explanation
Naphthalene is a fused cyclic aromatic compound because two benzene rings share a pair of adjacent carbon atoms and form one fused ring system. Biphenyl also contains two benzene rings, but they are joined by a single bond rather than fused. The likely mistake is choosing biphenyl because it has two aromatic rings, without checking whether the rings share atoms.
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About Benzene and Aromatic Compounds
Benzene has a planar ring of delocalised π electrons, giving aromatic stability and equal carbon-carbon bond lengths. The topic covers resonance, electrophilic substitution reactions such as nitration, halogenation, sulphonation and Friedel-Crafts reactions, along with substituent effects and the distinction between substitution in benzene and addition in ordinary alkenes.
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