How many electrons are there in benzene to form delocalized electron cloud________________?
Correct answer: C. 6
- A. 3
- B. 4
- C. 6
- D. 8
Explanation
Each of benzene's three p orbitals contributes a pair of pi electrons to the delocalised electron cloud, giving 3 x 2 = 6 delocalised electrons. This satisfies the 4n + 2 aromaticity rule with n = 1. Students may choose 3 by counting orbitals or double bonds instead of electrons.
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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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