QJEEM22Ch0603: JEE Main 2022 Chemistry - Class 11 JEEM22Ch0603 Solution: The reagent neutral ferric chloride is used to detect the…

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The reagent neutral ferric chloride is used to detect the presence of ______________

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Acetate ions gives deep red colour ppt on reaction with netural ferric chloride solution.

6 \mathrm{CH}_{3} \mathrm{COO}^{-}+3 \mathrm{Fe}^{3+}+2 \mathrm{H}_{2} \mathrm{O} \longrightarrow {\left[\mathrm{Fe}_{3}(\mathrm{OH})_{2}\left(\mathrm{CH}_{3} \mathrm{COO}\right)_{6}\right]^{+} + 2 \mathrm{H}^{+}}

{\left[\mathrm{Fe}_{3}(\mathrm{OH})_{2}\left(\mathrm{CH}_{3} \mathrm{COO}\right)_{6}\right]^{+} 4 \mathrm{H}_{2} \mathrm{O} \longrightarrow} \left.\left.\underset{\text{Brown red ppt}}{3\left[\mathrm{Fe}(\mathrm{OH})_{2}\left(\mathrm{CH}_{3} \mathrm{COO}\right)\right]}+3 \mathrm{CH}_{3} \mathrm{COOH}\right)_{2}\left(\mathrm{CH}_{3} \mathrm{COO}\right)_{6}\right]^{+}+2 \mathrm{H}^{+}

Phenol reacts with freshly prepared ferric chloride solution and gives violet colour complex.

6 C_{6} H_{5} OH + {FeCl}_{3} ⟶ \underset{Violet colour}{{[Fe {(C_{6} H_{5} O)}_{6}]}^{3 -}} + 3 HCl + 3 H^{+}

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