Phenanthrene is a fused polycyclic compound contains __________ benzene rings ?
Correct answer: B. Three
- A. Two
- B. Three
- C. Four
- D. Five
Explanation
Phenanthrene is made of three fused benzene rings arranged in an angular structure. Students may choose two because they count only the outer rings or confuse phenanthrene with naphthalene, which contains two fused benzene rings.
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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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