Which one of the following compounds will not be soluble in sodium bicarbonate?

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 B o-Nitrophenol
o-Nitrophenol will not be soluble in sodium bicarbonate.
o-Nitrophenol is a very weak acid and it does not reacts with sodium bicarbonate.
The acidity of 2, 3, 6 - Trinitrophenol is higher and it reacts with sodium bicarbonate.
Benzoic acid and Benzene sulphonic acid are stronger acids and they also react with sodium bicarbonate.
Thus 2, 3, 6 - Trinitrophenol, Benzoic acid and Benzene sulphonic acid are soluble in sodium bicarbonate.
$C_{6} H_{5} C O O H + N a H C O_{3} \to N a C_{6} H_{5} C O O + H_{2} O (l) + C O_{2} (g)$
$C_{6} H_{5} S O_{2} O H + N a H C O_{3} \to C_{6} H_{5} S O_{2} O N a + H_{2} O + C O_{2}$

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