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Question

Above compounds can be differentiated by which of the following chemical test? (used in decreasing order).
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A
NaOH,NaHCO3,HCl
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B
HCl,NaOH,NaHCO3
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C
NaHCO3,NaOH,HCl
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D
NaOH,HCl,NaHCO3
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Solution

The correct option is C NaHCO3,NaOH,HCl
As mnitrophenol and mnitrobenzoic acid are acidic in nature.
mnitrobenzene is a neutral compound.
mnitro aniline is a basic compound.
Now, as Mnitrobenzoic acid is enough acidic that it can react with NaHCO3, but mnitro phenol does not. Mnitrophenol can react with NaOH.
Thus first we add NaHCO3, to which mnitrobenzoic acid react and become soluble.
Then we take the residue and NaOH is added to it. Now mnitrophenol become soluble as it reacts with NaOH to make salt.
Then the residue is taken which contain mnitrobenzene and mnitro aniline .
Then we add acid, mnitro aniline reacts with acid and become soluble. In residue only mnitro benzene remains.
Thus the reagent use is in the following order.
NaHCO3,NaOH,HCl

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