196.Write three reactions to show the acidity of alkynes.
(i) Action with sodamide: Acetylene reacts with sodamide to produce sodium acetylide and evolves ammonia.
(ii) Action with ammonical silver nitrate (Tollen's reagent): When acetylene is passed through ammonical silver nitrate, a white precipitate of silver acetylide is produced.
(iii) Action with ammonical cuprous chloride: When acetylene is passed through ammonical cuprous chloride, a red precipitate of cuprous acetylide is produced.
All these reactions indicate that acetylenic hydrogen atoms are acidic in nature.
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197.
Alkynes are acidic in nature, whereas alkenes and alkanes are not. Explain.
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Short Answer Type
198.
Arrange benzene, n-hexane and ethyne in decreasing order of acidic behaviour. Also give reason for his behaviour.
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199.
Give simple chemical test for the distinction of: (i) Propyne and propane
(ii) But-1-yne and But-2-yne.
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200.
How will you separate acetylene from a mixture of acetylene and ethylene?