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The order of ka values of the following acids is :-

Options

  1. A(i) > (iv) > (iii) > (iv)
  2. B(iv) > (i) > (iii) > (ii)
  3. C(iii) > (iv) > (i) > (ii)
  4. D(iv) > (i) > (ii) > (iii)

Correct answer

B. (iv) > (i) > (iii) > (ii)

Step-by-step solution

Ka ∝ Acidity (iv) is most acidic as its conjugate base is stabilized by the two − OH groups by intra-molecular H -bonding. (ii) is least acidic as conjugate base is not stabiilized by H -bond.

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