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Asked in PMC Practice Test 27 (2021) 2021

Ethene is obtained by electrolyzing

Correct answer: B. Potassium succinate

  • A. Potassium formate
  • B. Potassium succinate
  • C. Potassium acetate
  • D. Potassium fumarate

Explanation

Option B is correct since Kolbe's electrolysis of potassium succinate gives CO2 and C2H4. Option A is incorrect since if Na(HCOO) is taken in a molten state then the electrolysis will provide Na+ and HCOO- ions and if the temp is high then H2 and CO2 will be released. Option C is incorrect since electrolysis of potassium acetate does not produce ethane. Option D is incorrect since electrolysis of potassium fumarate gives acetylene.

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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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