Explain the acidity of which is more : C2H5-OH and C6H5OH.
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Because phenol (C6H5OHC6H5OH) forms a more stable ion than ethanol (C2H5OHC2H5OH).
Here they are
Acids react by dissociating in water to release a hydrogen ion. So let us see how phenol and ethanol dissociate.
Phenol dissociates to form phenoxide ion. Ethanol dissociates to form ethoxide ion. In both cases, a water receives a hydrogen ion to form a hydronium ion.
Phenyl is an electron withdrawing group. The lone pairs of electrons on oxide and the double bonds in phenyl join together to form an electron cloud above and below the benzene ring. This delocalizes the negative charge and spreads it all over the phenoxide ion.
Alkyl groups are electron donating.
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