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Phenols are much more acidic than alcohols. This is indicated in the order of acidity constant:
Ka Gernal formula
PHENOLS 10-10 Ar-OH
ALCOHOLS 10-18 C-OH
Phenols are more acidic due to the formation of phenoxide ions & phenoxide ions are stable due to resonance, the negative charge on oxygen is spread throughout the benzene ring & is delocalised. On the other hand no resonance is possible in alkoxide ions derived from alcohol. The negative charge is localised on single oxygen atom.
Wiki User
∙ 13y ago
Wiki User
∙ 11y agoPhenols are ''more acidic'' than alcohol since phenols can delocalize its electrons. Also, phenols can remove its hydrogen to make it more stable. The ion is called the phenolate ion.
Acidity depends on the concentration of H+. Due to higher electronegativity of sp2 hybridised carbon of phenol the electron density on the oxygen decreases and hence increases the polarity O-H making the phenol unstable compared to phenolate, so it is more acidic. The C6H5-group is a fully sp2-hybridised electron pulling group.
If you have electron providing groups (sp3) in CH3-CH2-O-H, it may decrease the polarity of O-H bond and destabilize the negatively charged ethanoate group (CH3CH2O-)
Wiki User
∙ 13y agoAcidity depends on the concentration of H+. Due to higher electronegativity of sp2 hybridised carbon of phenol, the electron density on the oxygen decreases and hence increases the polarity O-H making the phenol unstable compared to phenolate, so it is more acidic. The C6H5-group is a fully sp2-hybridised electron pulling group.
If you have electron providing groups (sp3) in CH3-CH2-O-H, it may decrease the polarity of O-H bond and destabilize the negatively charged ethanoate group (CH3CH2O-)
Wiki User
∙ 10y agoAlcohol is still slightly acidic. Methanol for instance is around pH 6.8
Wiki User
∙ 12y agoalcohol. have hydrogen bond
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Why are alcohols considered as weak acids?
Due to resonance RCOO- ion in carboxyllic acid is more stable than that of RCO- ion in alcohols. Carboxyllic acid can more easily furnish H+ ion than that of alcohols. Carboxyllic acid is more acidic than alcohols.
How is adding ammonia to a mixture going to make it more acidic?
An ammine ligand attached to a metal ion is remarkably more acidic than a free ammonia molecule
Phenol are acidic in nature but alcohol not yet?
Phenol is more acidic than alcohols since the negative charge that is acquired by removal of a hydrogen atom can be delocalised into the molecules ring structure. acyclic alcohols cannot "spread" this charge as well as conjugated systems and thus will less readily lose their hydrogen atom.
Why do aldehydes and ketones have lower boiling points than their correspending alcohols?
Ketones and aldehydes do not have hydrocarbon atoms which bond to nitrogen or oxygen, individual molecules do not hydrogen bond to each other which makes them have lower boiling points than alcohols.
Are thiols are much more acidic than alcohols?
Yes, because sulfur is a larger atom than oxygen, so can therefore stabilize the conjugate base more effectively. Stability of the conjugate base means increased acidity, ie decreased pH and pKa
Why are alcohols considered as weak acids?
Due to resonance RCOO- ion in carboxyllic acid is more stable than that of RCO- ion in alcohols. Carboxyllic acid can more easily furnish H+ ion than that of alcohols. Carboxyllic acid is more acidic than alcohols.
How is adding ammonia to a mixture going to make it more acidic?
An ammine ligand attached to a metal ion is remarkably more acidic than a free ammonia molecule
Why aromatic alcohols are more acidic than aliphatic alcohols?
aromatic alcohols undergo resonance which stabilizes the conjugate base, in aliphatic alcohols +I effect of alkyl group increase the -ve charge in the conjugate base thus make it unstable
Is alcohol more acidic than water?
Generally yes, water has a higher Ka value than most alcohols including beverage alcohol.
Phenol are acidic in nature but alcohol not yet?
Phenol is more acidic than alcohols since the negative charge that is acquired by removal of a hydrogen atom can be delocalised into the molecules ring structure. acyclic alcohols cannot "spread" this charge as well as conjugated systems and thus will less readily lose their hydrogen atom.
Why do aldehydes and ketones have lower boiling points than their correspending alcohols?
Ketones and aldehydes do not have hydrocarbon atoms which bond to nitrogen or oxygen, individual molecules do not hydrogen bond to each other which makes them have lower boiling points than alcohols.
Polyhydroxyl alcohols are alcohols with more than one hydroxyl group attached to a carbon sequence?
molecule
Are thiols are much more acidic than alcohols?
Yes, because sulfur is a larger atom than oxygen, so can therefore stabilize the conjugate base more effectively. Stability of the conjugate base means increased acidity, ie decreased pH and pKa
Why tertiary alcohol reacts with metallic sodium less rapidly than primary alcohol?
Tertiary alcohols have a bulky alkyl group bonded to the carbon atom that carries the hydroxyl group. This bulky group hinders the approach of the sodium atom, making the reaction less rapid. In contrast, primary alcohols have a smaller alkyl group and allow for easier access and reaction with metallic sodium.
Is water more acidic than phenol?
No. Phenol is far more acidic than water.
What is more acidic lemon pH equals 2 soap pH equals 10 tomato pH equals 4 or ammonia pH equals 11.5?
The answer is lemon is the most acidic with pH 2; the next most acidic is tomato with pH 4.The soap with pH 10 is alkaline; and ammonia with pH11.5 is more alkaline than the soap.To understand pH, always remember that the values from 1 to 7 are all acidic, neutral is 7.5, and all the values from 8 to 14 are alkaline.
Is a lemon more acidic than a grapefruit?
a lemon is more sour than a grapefruit because it is more acidic.
