which of the following is most acidic. -
a.ethanol
b.m-cresol
c.phenol
d.onitrophenol
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Which of the following is the most acidic: ethanol, m-Cresol, phenol, or O-Nitrophenol?
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1 ANSWER

Soumya Mishra, Penchant follower of organic chemistry.
Answered Aug 12
The answer is O-nitrophenol.
Now if we consider in increasing order of acidity the series should be
Ethanol < m-Cresol < phenol < O-nitrophenol
Ethanol is a strong alcohol due to strong hydrogen bonding present in it which makes it difficult to be deprotonated i.e. H+ ion is difficult to be removed.
m-Cresol has a -CH3 group attached to Phenol at meta position. Since -CH3 is an Electron Donating group and has +I effect it decreases the density on the O atom thereby decreasing the acidity.
Phenol is a weak acid but stronger than the previous two because it can be deprotonated due to Resonance hence it could be stable.
Now with O-nitrophenol we already have NO2 group which is a strong -I, -M as well as Electron withdrawing group due to which it decreases the electronic density on O atom of Phenoxide and as well has intra-molecular hydrogen bonding with -OH group.
Hope so this helps. :)
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1 ANSWER

Soumya Mishra, Penchant follower of organic chemistry.
Answered Aug 12
The answer is O-nitrophenol.
Now if we consider in increasing order of acidity the series should be
Ethanol < m-Cresol < phenol < O-nitrophenol
Ethanol is a strong alcohol due to strong hydrogen bonding present in it which makes it difficult to be deprotonated i.e. H+ ion is difficult to be removed.
m-Cresol has a -CH3 group attached to Phenol at meta position. Since -CH3 is an Electron Donating group and has +I effect it decreases the density on the O atom thereby decreasing the acidity.
Phenol is a weak acid but stronger than the previous two because it can be deprotonated due to Resonance hence it could be stable.
Now with O-nitrophenol we already have NO2 group which is a strong -I, -M as well as Electron withdrawing group due to which it decreases the electronic density on O atom of Phenoxide and as well has intra-molecular hydrogen bonding with -OH group.
Hope so this helps. :)
afreenakbar05:
sorry for the upper part as it's mistakely send
the ans is phenol
oh..sorry
i have answerd
yes are you right.
yeah
hmm..
Answered by
1
phenol is the most acidic character
yes
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