A gas decolorized alkaline KMnO4 solution but does not give any PPT with ammoniacal AgNO3
Correct answer: B. Ethylene
- A. Methane
- B. Ethylene
- C. Ethane
- D. None of the above
Explanation
Option d) "None of the above" is incorrect because ethylene (option b) decolorizes KMnO4 but does not give a precipitate with ammoniacal AgNO3. Methane (option a) and ethane (option c) are both saturated hydrocarbons with only single bonds and are not reducing agents, so they would not decolorize KMnO4 or react with ammoniacal AgNO3 to form a precipitate. Therefore, the correct answer is option b) Ethylene.
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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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