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Q. The correct order of acidic strength of the carboxylic acid is

Aldehydes Ketones and Carboxylic Acids

Solution:

Acidic strength order
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Because the $S . O$ of $C B'$ is
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As, the acidic strength order $1>2>4>3$.
So, $BrCH _{2} CH _{2} CO _{2} H$ is weakest acid and hence it has smallest value of dissociation constant.