New carbon-carbon bond formation in Friedel-Craft's alkylation

Friedel-Craft's alkylation is a chemical reaction in which an alkyl halide is added to an aromatic compound in the presence of a strong Lewis acid catalyst, such as aluminum chloride (AlCl3). This reaction leads to the formation of a new carbon-carbon bond between the alkyl group and the aromatic ring.

Mechanism of Friedel-Craft's alkylation

The mechanism of Friedel-Craft's alkylation involves the formation of a complex between the Lewis acid catalyst and the alkyl halide, which activates the alkyl halide towards nucleophilic attack. The aromatic ring is then attacked by the activated alkyl group, leading to the formation of a carbocation intermediate. The carbocation intermediate is then stabilized by the Lewis acid catalyst and the reaction proceeds to form the final product.

Importance of Friedel-Craft's alkylation

Friedel-Craft's alkylation is an important reaction in organic chemistry as it allows for the introduction of alkyl groups onto aromatic compounds, which can lead to the formation of new molecules with unique properties. This reaction is widely used in the synthesis of pharmaceuticals, agrochemicals, and fragrances.

Conclusion

In conclusion, the correct option for the given question is D) Friedel-Craft's alkylation, as it is the only reaction listed that involves the formation of a new carbon-carbon bond between an alkyl group and an aromatic ring. Other reactions, such as Aldol condensation, Kolbe's reaction, and Reimer-Tiemann reaction, do not involve the formation of a new carbon-carbon bond between an alkyl group and an aromatic ring.