Discussion
An organic liquid 'A' containing C, H and O with pKa value 15.9, used in polishing woods, on heating with concentrated sulphuric acid gives a gaseous product 'B' with the empirical formula, CH2. 'B' decolourises bromine water as well as dilute permanganate solution. The compound A and B are respectively
Answer: D
A and B are ethanol and ethene.
A liquid alcohol with pKa about 15.9, used in varnishes and polishes, is ethanol. Heated with concentrated sulphuric acid it dehydrates to ethene, C2H4, whose empirical formula is CH2. As an alkene, ethene decolourises bromine water and dilute alkaline permanganate (Baeyer's test).
Methane and ethane are saturated and do not decolourise these reagents, and ethane's empirical formula is CH3. Phenol is a solid, more acidic (pKa about 10), and does not dehydrate to an alkene.
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