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

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(A) The acidity of the compounds depends on the electron-withdrawing effect of the substituents attached to the ring. $A$ contains a $-NO_2$ group,whi

Vedclass · Accepted Answer

$A > B > C$

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(A) The acidity of the compounds depends on the electron-withdrawing effect of the substituents attached to the ring. $A$ contains a $-NO_2$ group,which is a strong electron-withdrawing group ($-I$ effect). $B$ contains a $-CN$ group,which is also an electron-withdrawing group ($-I$ effect),but weaker than $-NO_2$. $C$ contains an $-OH$ group,which acts as an electron-donating group ($+M$ effect) or weakly electron-withdrawing ($-I$ effect),but overall it is less acidic than the compounds with strong $-I$ groups. Therefore,the order of acidity ($K_a$ value) is $A > B > C$.

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

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