Answer :

a) The reaction using a Grignard reagent in a Friedel-Crafts reaction can be represented as follows:

[tex]\[ \ce{RMgX + Ar-Cl - > Ar-R + MgClX} \][/tex]

a) In the Friedel-Crafts reaction, an aromatic compound (Ar-Cl) reacts with a Grignard reagent (RMgX) to form a new carbon-carbon bond. The Grignard reagent acts as a nucleophile, attacking the electrophilic carbon of the aromatic ring, resulting in the substitution of the chlorine atom with the alkyl group from the Grignard reagent. This process leads to the formation of a new carbon-carbon bond, resulting in the addition of the alkyl group to the aromatic ring.

b) The reaction proceeds via a carbocation intermediate, which is stabilized by the resonance in the aromatic ring. This allows for the formation of the desired alkylated product. The Grignard reagent, being highly reactive due to the presence of the magnesium halide bond, readily donates its alkyl group to the electrophilic carbon of the aromatic ring, facilitating the Friedel-Crafts alkylation reaction.

c) The Friedel-Crafts reaction is an important tool in organic synthesis for the introduction of alkyl groups onto aromatic rings. It allows for the synthesis of a wide range of substituted aromatic compounds, which are valuable intermediates in the production of various organic compounds. The use of Grignard reagents in this reaction expands the scope of accessible alkyl groups for introduction onto aromatic rings, enabling the synthesis of diverse organic molecules with tailored properties and functionalities.

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Rewritten by : Barada