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Q.
The correct order of acidity for the following compounds is
Aldehydes Ketones and Carboxylic Acids
Solution:
Due to ortho-effect, $(I)$ and $(II)$ are stronger acid than $(III)$ and $(IV)$. Due to two ortho hydroxyl groups in $(I)$, it is stronger acid than $(II). (Ill)$ is a stronger acid than $(IV)$ because at m-position, $-OH$ group cannot exert its $+R$ effect but can only exert its $-I$ effect while at $p-$ position, $-OH$ group exerts its strong $+R$ effect. Thus, the correct order of acidity is $: I > II > III > IV$.
