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प्रश्न
Phenol is less acidic than ______.
विकल्प
ethanol
o-nitrophenol
o-methylphenol
o-methoxyphenol
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उत्तर
Phenol is less acidic than o-nitrophenol.
Explanation:
In o-nitrophenol, nitro group is present at ortho position. Presence of electron-withdrawing group at ortho position increases the acidic strength. On the other hand, in o-methylphenol and in o-methoxyphenol and in o-methoxyphenol, electron releasing group \[\ce{(-CH3-OCH3)}\]
Presence of these groups at ortho or para positions of phenol decreases the acidic strength of phenols. So, phenol is less acidic than o-nitrophenol.
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\[\begin{array}{cc}
\phantom{.}\ce{CH3 - CH - CH - CH - CH - CH3}\phantom{}\\
\phantom{......}|\phantom{......}|\phantom{......}|\phantom{.....}|\phantom{........}\\
\phantom{...}\ce{CH3}\phantom{...}\ce{OH}\phantom{...}\ce{C2H5}\phantom{.}\ce{OH}\phantom{...}\end{array}\]
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