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The hydrocarbon which decolourises alkaline KMnO₄ solution ,but does not give any precipitate with ammonical silver nitrate is
- a)Benzene
- b)Acetylene
- c)Propyne
- d)Butyne-2
Correct answer is option 'D'. Can you explain this answer?
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The hydrocarbon which decolourises alkaline KMnO solution ,but does no...
Hydrocarbon that decolourises alkaline KMnO4 solution but does not give any precipitate with ammonical silver nitrate is 2-butyne.
Explanation:
- Alkaline KMnO4 solution is used to oxidize alkenes and alkynes. Alkenes are oxidized to diols and alkynes are oxidized to diketones.
- When 2-butyne is reacted with alkaline KMnO4 solution, it is oxidized to but-2-yne-2,3-diol. The solution turns from purple to colourless.
- The reaction can be represented as:
2-butyne + 2 [O] → but-2-yne-2,3-diol
- Ammonical silver nitrate is used to differentiate between alkynes. Alkynes give a white precipitate with ammonical silver nitrate.
- When 2-butyne is reacted with ammonical silver nitrate, it does not give any precipitate. This is because the triple bond is located at the end of the carbon chain, making it inaccessible to the silver ion.
The structure of 2-butyne is:
H-C≡C-C≡C-H
Thus, the correct answer is option D, Butyne-2.
Explanation:
- Alkaline KMnO4 solution is used to oxidize alkenes and alkynes. Alkenes are oxidized to diols and alkynes are oxidized to diketones.
- When 2-butyne is reacted with alkaline KMnO4 solution, it is oxidized to but-2-yne-2,3-diol. The solution turns from purple to colourless.
- The reaction can be represented as:
2-butyne + 2 [O] → but-2-yne-2,3-diol
- Ammonical silver nitrate is used to differentiate between alkynes. Alkynes give a white precipitate with ammonical silver nitrate.
- When 2-butyne is reacted with ammonical silver nitrate, it does not give any precipitate. This is because the triple bond is located at the end of the carbon chain, making it inaccessible to the silver ion.
The structure of 2-butyne is:
H-C≡C-C≡C-H
Thus, the correct answer is option D, Butyne-2.
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The hydrocarbon which decolourises alkaline KMnO solution ,but does not give any precipitate with ammonical silver nitrate isa)Benzeneb)Acetylenec)Propyned)Butyne-2Correct answer is option 'D'. Can you explain this answer?
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