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Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R: Assertion A: p K a value of phenol is 10 . 0 while that of ethanol is 15 . 9 . Reason R: Ethanol is stronger acid than phenol. In the light of the above statements, choose the correct answer from the options given below:

Options

  1. AA is true but R is false
  2. BA is false but R is true
  3. CBoth A and R are true and R is the correct explanation of A
  4. DBoth A and R are true but R is NOT the correct explanation of A.

Correct answer

A. A is true but R is false

Step-by-step solution

pK a is a measure of the acidity of a particular molecule. It measures the strength of an acid by how tightly a proton is held by a Bronsted acid. The lower the value of pK a , the stronger the acid and the greater its ability to donate its protons. describe the acidity of a particular molecule. pK a = - logK a Hence, Assertion is true, Phenol is more acidic than ethanol because after losing a proton H + , phenol forms phenoxide ion which is stabilised by resonance whereas ethoxide ion is not.

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