The carboxylic acid which has maximum solubility in water is:

Phthalic acid

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Succinic acid

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Malonic acid

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Salicylic acid

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Solution

The correct option is C Malonic acid
The structures of the given carboxylic acids are:
Carboxylic acids form hydrogen bonds with water, thus they are soluble in water. But as the number of carbon increases in the acid, hydrophobic nature will also increase.Therefore, solubility decreases. Malonic acid is smallest dicarboxylic acid among the given carboxylic acids. Hence, it has maximum solubility in water.

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