MHT CET Chemistry question

Chemistry Aldehydes, Ketones and Carboxylic Acids MHT CET

Which of the following is the CORRECT order of acidic strength?

(A)\mathrm{CH_{3}COOH\ >\ ClCH_{2}COOH\ >\ Cl_{2}CHCOOH\ >\ Cl_{3}CCOOH}
(B)\mathrm{Cl_{3}CCOOH\ >\ Cl_{2}CHCOOH\ >\ ClCH_{2}COOH\ >\ CH_{3}COOH}Correct
(C)\mathrm{CH_{3}COOH\ >\ Cl_{3}CCOOH\ >\ Cl_{2}CHCOOH\ >\ ClCH_{2}COOH}
(D)\mathrm{CH_{3}COOH\ >\ ClCH_{3}COOH\ >\ Cl_{3}CCOOH\ >\ Cl_{2}CHCOOH}

Answer: (B)

Solution

Each additional electron-withdrawing Cl atom increases acid strength (pKa 0.65, 1.29, 2.86 and 4.76), so

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Question ID VK-080941