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Q. Which of the following is the correct order of acidic strength?

Aldehydes Ketones and Carboxylic Acids

Solution:

$-Cl$ increases the polarity of $-\overset{\underset{||}{O}}{C} -$ group because $-Cl$ is electron withdrawing in nature.

Therefore; the acidic strength of the compounds are: $Cl _{3} C . COOH > \,Cl _{2} CHCOOH >\, ClCH _{2} COOH >\, CH _{3} COOH$