alleryWhen ethanol is heated at 170 degrees C with excess concentrated sulphuric acid, the product is:
AEthanoic acid
BEthyl ethanoate
CEthane
DEthene
Answer & Solution
Correct answer: D. Ethene
1. At 170 degrees C concentrated sulphuric acid acts as a dehydrating agent.
2. One molecule of water is removed from ethanol.
3. This forms the unsaturated compound ethene (CH2=CH2).
4. Rule out A: ethanoic acid forms by oxidation, not dehydration.
5. Rule out B: ethyl ethanoate forms by esterification with an acid, not here.
6. Rule out C: ethane would need addition of hydrogen, which is not happening.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 9 "Carbon Compounds", p.137_
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