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  4. Which of the following acids has the smallest dissociation constant?

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Q. Which of the following acids has the smallest dissociation constant?

WBJEEWBJEE 2008Aldehydes Ketones and Carboxylic Acids

Solution:

Group or atom attached with $- COOH$ group shows negative inductive effect, makes the acid stronger or acid has the larger dissociation constant. -Br shows poor negative inductive effect and also far away from $- COOH$, which makes $Br CH _{2} CH _{2} COOH$ weakest acid and hence, it has smallest dissociation constant.