AP EAMCET · Chemistry · Ionic Equilibrium

The \(\mathrm{p} K_a\) values of four carboxylic acids are given below. Identify the weakest carboxylic acid.

A \(4.89\)
B \(1.28\)
C \(4.76\)
D \(2.56\)

Verified Solution

Answer & Solution

Correct Answer

(A) \(4.89\)

Step-by-step Solution

Detailed explanation

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 \(K_a\).

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

Same subject

List-I (Compound)	List-II (Use)
A)	Kieselghur	I)	Chromatographic material
B)	Silica gel	II)	Softening of hard water
C)	ZSM-5	III)	Filtration plants
D)	Hydrated zeolites	IV)	To convert alcohol directly into gasoline

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