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(A) The given reaction is the sulphonation of chlorobenzene. Halogen atoms are ortho-para directing but deactivating groups due to the $-I$ effect. In

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Concentrated Sulphuric acid

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(A) The given reaction is the sulphonation of chlorobenzene. Halogen atoms are ortho-para directing but deactivating groups due to the $-I$ effect. In the presence of concentrated sulphuric acid $(H_2SO_4)$,chlorobenzene undergoes an aromatic electrophilic substitution reaction. The electrophile involved is sulphur trioxide $(SO_3)$. The reaction produces $2-$chlorobenzenesulphonic acid (minor product) and $4-$chlorobenzenesulphonic acid (major product). Therefore,concentrated sulphuric acid is the best suitable reagent for this reaction.

Identify the best suitable reagent for the following reaction.

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