Which compound has the highest value of pK_a? | vedclass

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(B) $pK_a$ is inversely proportional to the acidity of the compound $(pK_a \propto 1/K_a)$.Electron-withdrawing groups $(EWG)$ like $-Cl$ increase aci

Vedclass · Accepted Answer

$CH_3-CH_2-COOH$

Vedclass · Answer

(B) $pK_a$ is inversely proportional to the acidity of the compound $(pK_a \propto 1/K_a)$.Electron-withdrawing groups $(EWG)$ like $-Cl$ increase acidity (decrease $pK_a$) through the $-I$ effect.The closer the $EWG$ is to the $-COOH$ group,the stronger the effect.Electron-donating groups $(EDG)$ like alkyl groups increase $pK_a$ (decrease acidity) through the $+I$ effect.Among the given options,$CH_3-CH_2-COOH$ has no electron-withdrawing groups,making it the weakest acid and thus having the highest $pK_a$ value.

Which compound has the highest value of $pK_a$?

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