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JEE Main levelSingle correct optionDifficulty 2 of 3g1008

Arrange in decreasing order of acid strength: (P) $CH X_{3} COOH$ , (Q) $ClCH X_{2} COOH$ , (R) $NCCH X_{2} COOH$ , (S) $O X_{2} NCH X_{2} COOH$ .

AP > Q > R > S
BS > Q > R > P
CS > R > Q > P
DQ > R > S > P

Answer: C

Acid strength rises with the -I strength of the substituent on the alpha carbon, in the order

- NO X_{2} > - CN > - Cl > - H

. This gives S > R > Q > P (pKa about 1.7, 2.5, 2.9, 4.8).

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