Which of the following substituents is electron-withdrawing when added to a benzene ring?
Correct answer: A. - NO2
- A. - NO2
- B. - NH2
- C. - OH
- D. F
Explanation
The nitro group (NO2) is electron-withdrawing due to the high electronegativity of nitrogen, which pulls electrons away from the benzene ring. This decreases the electron density in the ring, making it less reactive towards electrophiles. The other options, NH2, OH, and F, are all electron-donating groups, increasing the electron density in the ring and making it more reactive towards electrophiles.
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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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