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The addition of mercury changes the orientation in a number of aromatic sulfonation reactions.

(a) True

(b) False

I had been asked this question by my college director while I was bunking the class.

Asked question is from Catalyst and Sulfonating Agents topic in section Sulfonation and Sulfation of Unit Processes

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Correct choice is (a) True

Explanation: The addition of mercury changes the orientation in a number of aromatic sulfonation reactions. This is of great practical importance especially with anthraquinone, since in the presence of the catalyst the a-sulfonate is formed almost exclusively, while without mercury only the, B-sulfonate is obtained.

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