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A compound  { }^{\prime} \mathrm{X}^{\prime}  is acidic and it is soluble in \mathrm{ \mathrm{NaOH}} solution, but insoluble in \mathrm{ \mathrm{NaHCO}_{3}\; solution. } Compound \mathrm{ ' X'} also gives violet colour with neutral \mathrm{\mathrm{FeCl}_{3}}  solution. The compound  \mathrm{ ' X^{\prime}} is :

Option: 1


Option: 2


Option: 3


Option: 4


Answers (1)

best_answer

Phenols are weakly acidic, therefore they are 

Soluble in \mathrm{NaOH} solution but at the same time they are not sufficiently acidic to be soluble is \mathrm{NaHCO_{3}} solution. phenols gives violet coloured complex with neutral \mathrm{FeCl_{3}} solution.

\mathrm{6 C_{6}H_{5}OH+FeCl_{3}\longrightarrow \left [ Fe\left ( C_{6}H_{5}O \right ) _{6}\right ]3^{-}+3HCl+3H^{+}}
                                                      (violet complex)

So compound \mathrm{X} is phenol.
So. option (2) is correct.

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