Which of the following will not be soluble in sodium hydrogen carbonate?

2, 4, 6-trinitrophenol

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Benzoic acid

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o-Nitrophenol

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Benzene sulphonic acid

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Solution

The correct option is A o-Nitrophenol
o-Nitrophenol will not be soluble in sodium hydrogen carbonate.
Acids stronger than $H_{2} C O_{3}$ give $C O_{2}$ gas with sodium hydrogen carbonate and also soluble in it.
2, 4, 6-trinitrophenol, Benzoic acid and Benzenesulphonic acid stronger acids than $H_{2} C O_{3}$ .
They react with sodium hydrogen carbonate to form water-soluble sodium salts.
o-Nitrophenol is a weaker acid than $H_{2} C O_{3}$ . It does not react with sodium hydrogen carbonate.

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