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Question

Which of the following will maximum pKa value?

A
Phenol
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B
o-cresol
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C
ethanol
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D
o-nitrophenol
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Solution

The correct option is C ethanol

Order of Acidity onitrophenol> phenol> ocresol> ethanol. onitrophenol is more acidic than phenol due to electron withdrawing nature of nitro group. o-crseol is less acidic than alcohol due to electron-releasing nature of methyl group. Phenoxide ion is resonance stabilized but ethoxide ion is not. Thus, phenol is more acidic than alcohol. Greater the pKavalue, less is the acidity.


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