1.

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

Answer»

IIIgtIVgtIIgtI
IIIgtIIgtIVgtI
IIgtIIIgtIgtIV
IIgtIIIgtIVgtI

Solution :due to strong -I and -R-effect of the three `-NO_(2)` groups, 2,4,6-trinitrophenol (III) is more acidic than `CH_(3)COOH` (II). Further, due to greater RESONANCE stabilization of acetate ion over phenoxide ion, acetic ACID (II) is a stronger acid than phenol (IV). since alcohols are less acidic than phenols. therefore, cyclohexanol (I) is less acidic than phenol (IV). thus, the OVERALL acidic character DECREASES in the order:
2,4,6-tribromophenol (III)gtacetic acid(II)gtphenol (IV)gtcyclohexanol (I), i.e., option (b) is correct.


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