2 interactive concept widgets for Alcohols, Phenols and Ethers. Drag any slider, change any number, and watch the formula and the answer update live. Built so you understand how each NEET problem actually works, not just the final number.
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Select alcohol type (1°, 2°, 3°) and oxidising agent (PCC, KMnO₄, K₂Cr₂O₇, MnO₂, NaBH₄). See the product that forms and why — especially the key difference between mild oxidants (stop at aldehyde) and strong oxidants (go to acid).
Select the type of alcohol and the oxidising agent to see what product forms. Understand why PCC stops at aldehyde while KMnO₄ goes all the way to carboxylic acid.
PCC and MnO₂ are mild oxidants. They oxidise primary alcohols to aldehydes but CANNOT oxidise the aldehyde further to a carboxylic acid. The mild oxidant removes H from both the α-carbon and the -OH, giving R-CHO. The reaction stops at the aldehyde stage. This is the KEY advantage of PCC: you can make aldehydes from primary alcohols without over-oxidation.
Stopped at aldehyde. PCC does not have enough oxidising power to oxidise R-CHO to R-COOH.
Visual pKa bar chart comparing ethanol, phenol, and substituted phenols (p-methyl, p-chloro, p-nitro, 2,4-dinitro). Click any compound to get the resonance explanation for its acidity.
See how substituents on the phenol ring affect acidity. Click any compound to understand the resonance and electronic effects behind the pKa value.
Ethanol
p-Methylphenol (p-Cresol)
Phenol
p-Chlorophenol
p-Nitrophenol
2,4-Dinitrophenol
C₆H₅OH
No substituent — reference
Phenoxide ion (C₆H₅O⁻) is stabilised by resonance with the benzene ring through 5 resonance structures. Negative charge delocalised over ring at ortho and para positions. This stabilisation dramatically increases acidity vs alcohols (pKa drops from ~16 to ~10). Reference compound for all phenol acidity comparisons.
Reference
Acid strength order: carboxylic acids > activated phenols (with -NO₂) > phenol > water > alcohols<br/>For phenol derivatives: EWG at ortho/para → more acidic; EDG at ortho/para → less acidic. Always ask: does the substituent stabilise the phenoxide ion (O⁻) by withdrawing electrons? If yes, more acidic.
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