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

Vedclass · Accepted Answer

$p$-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.

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

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