JEE · Chemistry · Alcohols, Phenols & Ethers doubts
12 doubts found
Why is phenol acidic enough to react with NaOH, but ordinary ethanol is not?
Both can lose the O–H proton, but the stability of what's left decides the acidity.
Why does ethanol mix with water in all proportions, but oil-like higher alcohols don't?
Ethanol's small O–H group hydrogen-bonds strongly with water, and its tiny carbon chain barely gets in the way, so the two mix completely.
How does the Lucas test tell primary, secondary and tertiary alcohols apart?
The Lucas reagent (conc.
Why does oxidising a primary alcohol give a different product than a secondary one?
Oxidation removes hydrogens from the C–OH carbon.
What does “Acidity of alcohols vs phenols” actually mean in Alcohols, Phenols & Ethers, and why does it matter for JEE?
phenols are far more acidic than alcohols because the phenoxide ion is stabilised by resonance into the ring.
I keep getting “Acidity of alcohols vs phenols” questions wrong in Alcohols, Phenols & Ethers. What's the trap?
ranking an alcohol as more acidic than a phenol.
What does “Oxidation of alcohols” actually mean in Alcohols, Phenols & Ethers, and why does it matter for JEE?
primary alcohols oxidise to aldehydes then acids, secondary to ketones, and tertiary resist oxidation (no H on the carbon).
I keep getting “Oxidation of alcohols” questions wrong in Alcohols, Phenols & Ethers. What's the trap?
trying to oxidise a tertiary alcohol to a ketone or acid.
What is the difference between primary alcohol and tertiary alcohol?
A primary alcohol oxidises easily (to an aldehyde/acid) and reacts slowly in the Lucas test; a tertiary alcohol resists oxidation and reacts instantly in the Lucas test (via a stable carbocation).
What is the difference between alcohol and ether?
An alcohol has an O–H group, so it hydrogen-bonds and has a higher boiling point; an ether (C–O–C) has no O–H, so it boils lower and is a common inert solvent.
How is Alcohols, Phenols & Ethers tested in JEE, and what should I focus on?
Prioritise the core ideas: Acidity of alcohols vs phenols, Oxidation of alcohols.
What are the most common mistakes students make in Alcohols, Phenols & Ethers?
phenols are much more acidic because resonance stabilises the phenoxide ion; simple alcohols are effectively neutral.