In Aromatic Compounds Substitution, direct substitution of iodine into the benzene nucleus is feasible only in the presence of what?(a) Azo compound(b) Reducing agent(c) Oxidizing agent(d) None of the mentionedThis question was addressed to me in unit test.My query is from Halogenation topic in chapter Halogenation of Unit Processes

In Aromatic Compounds Substitution, direct substitution of iodine into

1.	In Aromatic Compounds Substitution, direct substitution of iodine into the benzene nucleus is feasible only in the presence of what?(a) Azo compound(b) Reducing agent(c) Oxidizing agent(d) None of the mentionedThis question was addressed to me in unit test.My query is from Halogenation topic in chapter Halogenation of Unit Processes
Answer» CORRECT answer is (c) Oxidizing agent For explanation: In Aromatic Compounds Substitution, direct substitution of iodine into the benzene nucleus is FEASIBLE only in the presence of an oxidizing agent. The hydrogen iodide formed simultaneously with the iodo compound is UNSTABLE: the iodine in the benzene nucleus is loosely bound; and CONDITIONS must therefore be provided to AVOID reversibility.2C6H6 + I2 + (O) ——-> 2C6H5I + H2O.

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