Synthesis of disubstituted benzenes involves two steps, each introducing one of the functional groups. For the synthesis of p-chlorobenzenesulfonic acid, select the reagent for each step and draw the structure of the monosubstituted intermediate compound.

The synthesis of p-chlorobenzenesulfonic acid with the reagents for each step and the structure of the monosubstituted intermediate compound is shown in the drawing below.

Explanation:

Benzenesulfonic acid is obtained from the sulfonation of benzene, using concentrated smoking sulfuric acid.

Chlorination of benzenesulfonic acid with chlorine without catalyst requires a polar solvent, such as acetic acid to obtain the selectivity in the position for and the ortho derivative in a low proportion.

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