In the following compounds, the order of acidity is

III > IV > I > II

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I > IV > III > I

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II > I > III > IV

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IV > III > I > II

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Solution

The correct option is D
IV > III > I > II

+I effect decreases acidity, –I and –R effect increases acidity. $N O_{2}$ group cannot exert –R effect at the meta position so meta nitro benzoic acid is less acidic than ortho nitro benzoic acid.

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In the following compounds, the order of acidity is

The correct option is D IV > III > I > II +I effect decreases acidity, –I and –R effect increases acidity. NO2 group cannot exert –R effect at the meta position so meta nitro benzoic acid is less acidic than ortho nitro benzoic acid.

The correct option is D
IV > III > I > II

+I effect decreases acidity, –I and –R effect increases acidity. $N O_{2}$ group cannot exert –R effect at the meta position so meta nitro benzoic acid is less acidic than ortho nitro benzoic acid.