The reagent ' R ' in the given sequence of chemical reaction is: 2,4,6-tribromoaniline --NaNO₂, HCl, 0-5°C--> Diazonium salt --R--> 1,3,5-tribromobenzene
R: CH? OH Certain mild reducing agents like hypophosphorus acid or ethanol reduce diazonium salts to arene and themselves get oxidised to phosphorous acid and ethanal respectively.
<p><img ></p><p>R: CH? OH<br>Certain mild reducing agents like hypophosphorus acid or ethanol reduce diazonium salts to arene and themselves get oxidised to phosphorous acid and ethanal respectively.</p>
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