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In Friedel-Crafts alkylation of aniline, one gets

1. Alkylated product with ortho and para substitution.
2. Secondary amine after acidic treatment.
3. An amide product.
4. Positively charged nitrogen at benzene ring.

Correct answer: Positively charged nitrogen at benzene ring.

Solution

In Friedel-Crafts alkylation, the nitrogen atom of aniline can become positively charged due to the formation of a complex with the electrophile, which enhances the reactivity of the aromatic ring but also leads to the deactivation of the amine group, making it less nucleophilic.

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