When a hydrogen atom is removed from benzene, the group left behind is called:
Correct answer: B. Phenyl group
- A. Alkyl group
- B. Phenyl group
- C. Benzyl group
- D. Methyl group
Explanation
A is incorrect as alkyl group is formed when one hydrogen is removed from an alkane chain;not a benzene ring.B is correct as when one hydrogen is removed from a benzene ring, the formula becomes C6H5 (phenyl)C is incorrect as benzyl group has formula C6H5 CH2D is incorrect as when one hydrogen is removed from methane (CH3), methyl is formed.
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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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