Which acid has the least pK_a value? | vedclass

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Question

(A) The $pK_a$ value is inversely proportional to the acidity of the compound. Stronger acids have lower $pK_a$ values. The acidity of carboxylic acid

Vedclass · Accepted Answer

$Cl_3CCOOH$

Vedclass · Answer

(A) The $pK_a$ value is inversely proportional to the acidity of the compound. Stronger acids have lower $pK_a$ values. The acidity of carboxylic acids is increased by the presence of electron-withdrawing groups (like $Cl$) due to the inductive effect. $Cl_3CCOOH$ contains three chlorine atoms,which exert the strongest electron-withdrawing effect,stabilizing the carboxylate anion most effectively. Therefore,$Cl_3CCOOH$ is the strongest acid among the given options and has the least $pK_a$ value.

Which acid has the least $pK_a$ value?

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