Question

5. Give reason
(1) Ortho-nitrophenol is more acidic than ortho-methoxyphenol
(ii) o-and p-nitrophenols are more acidic than phenol
(iii)p-nitrophenol is more acidic than o-nitrophenol.
(iv)Phenol is more acidic than ethanol/ methanol.​

Answer 1

Answer:

Answers :-

1. Hence, ortho nitrophenol is a stronger acid . On the other hand methoxy group is an electron releasing group . Thus it increases the electron density in the O-H bond and hence , the proton cannot be given out easily . So ortho nitrophenol is more acidic .
2. O- , P- nitrophenol are more acidic than phenol because of fact that NO2 is best electron in drawing group .
3. p-nitrophenol is more acidic than o-nitrophenol because intermolecular H bond makes o-isomer is weaker than p-isomer . This increases the acidity of o-isomer .
4. Phenol is more acidic than methanol because phenoxide ion after loss of proton is more stable than methoxide ion after the loss of proton .

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