Discussion Forum : Alcohols Phenols And Ethers
Question -


Which of the following will maximum pKa value?

Options:
A .   Phenol
B .   o-cresol
C .    ethanol
D .   o-nitrophenol
Answer: Option C
:
C

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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