Question
Which of the following will maximum pKa value?
Answer: Option C
:
C
Order of Acidity−o−nitrophenol>phenol>o−cresol>ethanol. o−nitrophenol 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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:
C
Order of Acidity−o−nitrophenol>phenol>o−cresol>ethanol. o−nitrophenol 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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