Which one of the following is a powerful electrophile used to attack on the electrons of a benzene ring?
Correct answer: C. Cl+
- A. FeCl2
- B. FeCl4-
- C. Cl+
- D. Cl2
Explanation
When benzene reacts with a powerful electrophile like Cl+ (chlorine cation), it undergoes electrophilic aromatic substitution reactions where the positively charged carbon of Cl+ attacks the electron-rich benzene ring. This leads to the formation of chlorinated derivatives of benzene. In contrast, FeCl2 and FeCl4- act as Lewis acids, accepting electron pairs but not directly attacking benzene. Cl2 (chlorine gas) is unreactive towards benzene and does not serve as an electrophile in attacking the benzene ring.
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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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