How benzene can be prepared from Grignard reagent??!!!!
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The general formula of Great reagent is R-Mg-X or Ar-Mg-X
R- alkyl group
X -halogens
Ar - aryl group
So, for the preparation of benzene Ar-Mg-X is used .
ie, benzene chloride is treated with sodium in presence of dry ether to give grignard reagent (benzene magnesium chloride) which on hydrolysis gives benzene and an additional product.
C6H5Cl +Na (dry ether) — C6H5-Mg-Cl(H2O)—C6H5-H + Mg(OH)
C6H5-H means C6H6 which is the benzene we needed.
Halogens other than Cl can also be used and alkyl / aryl group is changed in accordance with the product required.
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