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.
This question appeared on the UHS MDCAT 2010 paper, which you can sit online with every answer explained.
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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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