What is the correct order of K_a values for t | vedclass

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(C) The acidic strength is directly proportional to the $K_a$ value and inversely proportional to the $pK_a$ value.Electron-withdrawing groups ($-M$ a

Vedclass · Accepted Answer

$IV > III > II > I$

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(C) The acidic strength is directly proportional to the $K_a$ value and inversely proportional to the $pK_a$ value.Electron-withdrawing groups ($-M$ and $-I$ effects) increase the acidic strength of phenols by stabilizing the phenoxide ion.Compound $(I)$ is phenol.Compound $(II)$ is $o$-nitrophenol ($-I$ and $-M$ effect of one $NO_2$ group).Compound $(III)$ is $p$-nitrophenol ($-I$ and $-M$ effect of one $NO_2$ group).Compound $(IV)$ is $2,4,6$-trinitrophenol (picric acid),which has three $NO_2$ groups exerting strong $-I$ and $-M$ effects.Comparing $(II)$ and $(III)$,$p$-nitrophenol $(III)$ is more acidic than $o$-nitrophenol $(II)$ due to intramolecular hydrogen bonding in $(II)$ which stabilizes the undissociated form.Thus,the order of acidic strength (and $K_a$) is: $(IV) > (III) > (II) > (I)$.

What is the correct order of $K_a$ values for the given compounds?

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