Correct increasing order of pka is

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IV > II > I > III

III

III < II < IV ≈ I

I < III < II ≈IV

answer is B.

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Detailed Solution

-CH3 group is a EDG ;EDG decrease the acidic strength of phenol -CH3 group at meta . . . +I effect only . . . less electron donor-CH3 group at ortha and para . . . +I, +R (H. C) . . . more electron donor∴acidic strength of III > I > II ≈IVpka of III(10) < I(10.1) < II ≈IV(10.2).

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