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Among the following, the reaction that proceeds through an electrophilic substitution, is:

1. C6H5N2Cl + Cu2Cl2 → C6H5Cl + N2
2. C6H6 + Cl2 → C6H5Cl + HCl
3. C6H6 + Cl2 UV light → C6H4Cl2
4. C6H5OH + HCl Heat → C6H5Cl + H2O

Correct answer: C6H6 + Cl2 → C6H5Cl + HCl

Solution

The reaction in option B involves benzene (C6H6) reacting with chlorine (Cl2) in the presence of a catalyst, typically FeCl3, to form chlorobenzene (C6H5Cl). This is a classic example of an electrophilic substitution reaction where the hydrogen atom on the benzene ring is replaced by a chlorine atom.

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