1. Tardigrade
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  3. Chemistry
  4. Among the following acids which has the lowest pKa value ?

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Q. Among the following acids which has the lowest $pK_a$ value ?

AIEEEAIEEE 2005Aldehydes Ketones and Carboxylic Acids

Solution:

Out of the given acids, strongest is $HCOOH$. (highest $K_a$ value)
Since $pK_a = - log\, K_a$
Thus lowest $pK_a$ is of $HCOOH$.