PHYSICAClass 12 Chemistry simulations · Alcohols, Phenols and Ethers
Acidity of phenols
Compare the pKₐ of ethanol, phenol and substituted phenols.
What to notice
Phenol is far more acidic than ethanol; nitro groups at ortho and para positions increase acidity more than at meta; picric acid is almost as strong as a mineral acid.
Key relation
smaller pKₐ = stronger acid ; –NO₂ at o/p stabilises phenoxide by resonance
Try this
Why is m-nitrophenol less acidic than p-nitrophenol?
What you can change
- Compound: 1 to 7
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