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Aldehydes, Ketones And Carboxylic Acids

Question
CBSEENCH12008737

Arrange the following compounds in increasing order of their property as indicated:

Benzoic acid, 4-nitrobenzoic acid, 2-nitrobenzoic acid, 2-Methyl benzoic acid (acid strength).

Solution
Benzoic acid < 2-Methyl benzoic acid < 4-Nitrobenzoic acid < 2, 4-Dinitrobenzoic acid.