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Q.

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Correct order of Pka is 

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a

A < C < B   D

b

A < D < B < C 

c

D < C < A < B

d

D < A < C < B 

answer is C.

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Detailed Solution

 CH3 group at o, p positions show +I, +R (Hyper conjugation)

   o, p cresols are least acidic.

 CH3 group at meta position show only +I effect

 meta cresol is more acidic than o & p cresols

 CH3 group is an EDG, cresols are less acidic than phenol

Experiments showed that Pka of  o  cresol = p cresol

  Pka of A(10) < C (10.1) < B = D (10.2) 

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