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MHT CET202617 April 2026Morning ShiftChemistryCarboxylic Acid DerivativesActual

When will be the acidic character of carboxylic acid higher in following cases ?

Options

  1. ALower K_a and pK_a values
  2. BLower K_a value and higher pK_a value
  3. CHigher K_a value and lower pK_a value
  4. DHigher K_a and pK_a values

Correct answer

C. Higher K_a value and lower pK_a value

Step-by-step solution

Acidic strength of a carboxylic acid is directly proportional to its acid dissociation constant K_a . Higher the value of K_a , stronger is the acid. The relationship between pK_a and K_a is given by pK_a = - K_a . Thus, a higher value of K_a corresponds to a lower value of pK_a . Therefore, higher acidic character corresponds to a higher K_a value and a lower pK_a value. Answer: Higher K_a value and lower pK_a value

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