Give the correct order of decreasing acidity of the following compound

1.	Give the correct order of decreasing acidity of the following compounds
Answer» Correct orderal acidity — IV > I > II > III In (IV), due to presence of three highly electron withdrawing -NO₂ group, (IV) has highest acidic character among them. In (II) due to presence of one -CH₃ (electron releasing) group. It has low acidic character them (I). In (III), due to presence of two -CH₃ group adjacent to -NO₂ group, -NO₂ group goes out of plane of benzene ring. That's why, it not participate in the conjugation (Resonance) with benzene ring. So, there is no -R effect of -NO₂ group. There is only, -I effect of -NO₂. That's why, it has lowest acidic character among them. Hence, the correct order of acidity will be — IV > I > II > III

Give the correct order of decreasing acidity of the following compounds

Answer»

Correct orderal acidity — IV > I > II > III

In (IV), due to presence of three highly electron withdrawing -NO₂ group, (IV) has highest acidic character among them.

In (II) due to presence of one -CH₃ (electron releasing) group. It has low acidic character them (I).

In (III), due to presence of two -CH₃ group adjacent to -NO₂ group, -NO₂ group goes out of plane of benzene ring. That's why, it not participate in the conjugation (Resonance) with benzene ring. So, there is no -R effect of -NO₂ group. There is only, -I effect of -NO₂. That's why, it has lowest acidic character among them.

Hence, the correct order of acidity will be —

IV > I > II > III

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