NEET 2010 Chemistry question

Given are cyclohexanol (I), acetic acid (II), 2,4,6-trinitrophenol (III) and phenol (IV). In these the order of decreasing acidic character will be:

(1)III > II > IV > ICorrect
(2)II > III > I > IV
(3)II > III > IV > I
(4)III > IV > II > I

Answer: (1)

Solution

Acidity depends on the stability of the conjugate base formed on losing . 2,4,6-Trinitrophenol (III, picric acid) (): the picrate ion is stabilised by resonance and by the strong and effects of three groups, so it is the strongest acid. Acetic acid (II) ($ =

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Question ID VK-090511