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  4. The correct order for the acidic character of the following carboxylic acids is

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Q. The correct order for the acidic character of the following carboxylic acids isChemistry Question Image

Aldehydes Ketones and Carboxylic Acids

Solution:

$V$ is most stable because its anion is stabilized to a greater extent through $H$ - bonding with $H$ atom of $OH$ present on both ortho-positions ; followed by II in which one $OH$ group is present. Compound IV comes next to II because here $- OCH _3$ group is present in ortho position which although is not capable of forming $H$-bonding yet more acidic than $p- HOC _6 H _4 COOH$ (III) due to ortho effect. Compound III is less acidic than benzoic acid because of electron-releasing group in the para position. Thus

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