A) \[m-\]chlorobenzoic acid \[(p{{K}_{a}}=3.98)\]
B) \[p-\]chlorocinnamic acid \[(p{{K}_{a}}=4.41)\]
C) \[2,\,\,5-\]dihydroxy benzoic acid \[(p{{K}_{a}}=2.97)\]
D) Acetoacetic acid \[(p{{K}_{a}}=3.58)\]
Correct Answer: C
Solution :
\[pH=p{{K}_{a}}+\text{log}\frac{\text{ }\!\![\!\!\text{ Salt }\!\!]\!\!\text{ }}{\text{ }\!\![\!\!\text{ Acid }\!\!]\!\!\text{ }}\]. For small concentration of buffering agent and for maximum buffer capacity \[\frac{\text{ }\!\![\!\!\text{ Salt }\!\!]\!\!\text{ }}{\text{ }\!\![\!\!\text{ Acid }\!\!]\!\!\text{ }}\approx 1\].
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