Ortho cresol is less acidic than phenol .why?
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Phenols are weakly acidic.Cresol is also phenol, here we need to compare carbolic acid with cresol.
Presence of electron withdrawing groups at ortho and para position increases the acidic strength,whereas electron releasing or donating groups at ortho and para position decreases acidic strength. In cresol (ortho or para cresol) ,methyl group is +I group,so it destabilises the anion formed after ionisation,hence cresol is less acidic than carbolic acid (phenol)
Presence of electron withdrawing groups at ortho and para position increases the acidic strength,whereas electron releasing or donating groups at ortho and para position decreases acidic strength. In cresol (ortho or para cresol) ,methyl group is +I group,so it destabilises the anion formed after ionisation,hence cresol is less acidic than carbolic acid (phenol)
sristymeera1974:
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Phenol is more acidic than cresol because in case of cresol there is one electron donating -CH3 group which increases the electron density on oxygen of cresol ( hyperconjugation and +I effect )and this leads to loss of proton little difficult as O-H bond become strong due to more electron density between them.
compound which could release proton easily are more acidic as compared to one in which loss of proton little difficult.
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