Practicing Success
Haloarenes undergo the usual electrophilic reactions of the benzene ring such as halogenation, nitration, sulphonation and Friedel-Crafts reactions. Halogen atom besides being slightly deactivating is o, p-directing; therefore, further substitution occurs at ortho- and para-positions with respect to the halogen atom. The o, p-directing influence of halogen atom can be easily understood if we consider the resonating structures of halobenzene as shown:
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Which catalyst is used for the Friedel-Crafts alkylation? |
ZnCl2 anhydrous AlCl3 FeCl3 Both option 2 and option 3 |
Both option 2 and option 3 |
Alkylation involves the alkylation of an aromatic ring with an alkyl halide using a strong Lewis acid, such as aluminium chloride, ferric chloride,
In Friedel-Crafts alkylation, benzene (and its derivatives) is alkylated with alkyl halide to form alkyl benzene.
In Friedel-Crafts acylation, benzene (and its derivatives) is acylated with acyl halide to form acyl benzene. |