When ethene is passed into cold concentrated sulphuric acid and the product is then diluted with water and warmed, the compound obtained is
Correct answer: C. ethanol
- A. ethane
- B. ethanoic acid
- C. ethanol
- D. ethanal
Explanation
Ethene adds sulphuric acid to give ethyl hydrogen sulphate, and hydrolysing that with water releases ethanol and regenerates the acid, which is the industrial route to ethanol from petroleum. The modern direct route passes ethene and steam over a phosphoric acid catalyst. Fermentation of sugar is the alternative, renewable route to the same product.
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About Alkenes
Alkenes are unsaturated hydrocarbons containing a carbon-carbon double bond with sigma and pi components and restricted rotation. Their reactions include electrophilic addition of hydrogen, halogens, hydrogen halides and water, with Markovnikov orientation, oxidation, combustion and polymerisation, while their preparation commonly involves elimination from alkyl halides or alcohols.
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