In the following compounds. The decreasing order of acidity is

  1. A

    I>IV>III>II

  2. B

    I>IV>I>II

  3. C

    II>I>III>IV

  4. D

    IV>III>I>II

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    Solution:

    The correct order of acidity IV>III>I>II.

    Acidity is more, when the phenol has more number of minus I groups. Since the minus I nature will stabilise the carbanion intermediate. When we se the general order of acidity then

    RCOOH > Phenol> water > alcohol > alkynes.

    Ka is proportional to acidity and inversely to Pka.
     

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