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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. (a) III > II > IV > I
2. (b) II > III > IV > I
3. (c) II > III > I > IV
4. (d) III > IV > I > II

Correct answer: (a) III > II > IV > I

Solution

The acidic strength depends on the stability of the conjugate base formed after losing a proton. 2,4,6-Trinitrophenol (III) is the most acidic due to strong electron-withdrawing nitro groups. Acetic acid (II) follows due to resonance stabilization of its carboxylate ion. Phenol (IV) is less acidic than acetic acid but more than cyclohexanol (I), which lacks resonance stabilization.

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