Carboxylic Acids Question 131

Question: Among the following acids which has the lowest $ pKa $ value

[AIEEE 2005]

Options:

A) $ CH_3COOH $

B) $ HCOOH $

C) $ {{(CH_3)}_2}CH-COOH $

D) $ CH_3CH_2COOH $

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Answer:

Correct Answer: B

Solution:

$ K _{a}\propto \frac{1}{pK _{a}} $ ; The value of $ K _{a} $ is highest for $ HCOOH $ .