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Q.
Arrange the following acids in order of their increasing acidity.
AMUAMU 2011Aldehydes Ketones and Carboxylic Acids
Solution:
Electron-donating substituents tend to decrease while electron-withdrawing
substituents tend to increase the acidic strength of substituted benzoic acids relative to benzoic adds. However, due to ortho-effect, $o$-nitro-benzoic add is the stronger add then $p$-nitrobenzoic add.