Which of the following compounds has the leas | vedclass

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(A) The $pK_a$ value is inversely proportional to the acidity of the compound. $A$ stronger acid has a lower $pK_a$ value.Among the given compounds,th

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$p$-nitrophenol

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(A) The $pK_a$ value is inversely proportional to the acidity of the compound. $A$ stronger acid has a lower $pK_a$ value.Among the given compounds,the nitro group $(-NO_2)$ is a strong electron-withdrawing group ($-I$ and $-M$ effects),which increases the acidity of phenol by stabilizing the phenoxide ion.$p$-nitrophenol is more acidic than $o$-nitrophenol because $o$-nitrophenol exhibits intramolecular hydrogen bonding,which stabilizes the undissociated molecule and reduces its acidity compared to $p$-nitrophenol.Therefore,$p$-nitrophenol is the most acidic and has the least $pK_a$ value.

List-$I$ (Compound)	List-$II$ $(pK_a)$
$A$. $p-$Nitrophenol	$I$. $7.1$
$B$. Phenol	$II$. $10.0$
$C$. Ethanol	$III$. $15.9$
$D$. $p-$Cresol	$IV$. $10.2$

Which of the following compounds has the least $pK_a$ value?

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$o-$Nitrophenol is less soluble in water than $p-$ and $m-$Nitrophenols because:

Match the following:
List-$I$ (Compound) List-$II$ $(pK_a)$
$A$. $p-$Nitrophenol $I$. $7.1$
$B$. Phenol $II$. $10.0$
$C$. Ethanol $III$. $15.9$
$D$. $p-$Cresol $IV$. $10.2$
The correct answer is

The order of reactivity of phenol $(I)$,nitrobenzene $(II)$,and benzene $(III)$ towards nitration is:

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