Correct order of Pka is

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A < D < B < C

D < A < C < B

A < C < B ≈ D

D < C < A < 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 phenolExperiments showed that Pka of o – cresol = p– cresol∴ Pka of A(10) < C (10.1) < B = D (10.2)

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