Which group deactivates the benzene ring?
Correct answer: B. -CHO
- A. -NH2
- B. -CHO
- C. -OR
- D. -OH
Explanation
The correct answer is -CHO because it is a meta directing group that deactivates the benzene ring by withdrawing electrons through inductive effects. This makes it different from -NH2,-OR, and -OH, which all activate the benzene ring by donating electrons through resonance. Therefore, options A, C, and D are incorrect.
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About Chemistry of Hydrocarbons
Hydrocarbons are studied through the structures and reactions of alkanes, alkenes, alkynes and aromatic compounds. Coverage includes free radical substitution in alkanes, electrophilic addition to carbon-carbon multiple bonds, benzene substitution, aromatic stability and the difference between addition reactions of alkenes and substitution reactions of benzene.
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