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Question: Answered & Verified by Expert
The $\mathrm{p} K_a$ values of four carboxylic acids are given below. Identify the weakest carboxylic acid.
ChemistryIonic EquilibriumTS EAMCETTS EAMCET 2013
Options:
  • A $4.89$
  • B $1.28$
  • C $4.76$
  • D $2.56$
Solution:
2792 Upvotes Verified Answer
The correct answer is: $4.89$
The more the value of $\mathrm{p} K_{\mathrm{a}}$, compound will be less acidic indicating the less value of $K_a$ and smaller the value of $\mathrm{pK} K_a$, the compound will be more acidic, i.e., there will be more the value of $K_a$.

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