Give 2 methods of preparation of Acetylene. How does it react with water and Hydrogen bromide.
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Answer:
Methods of prepartion of Acetylen: 1. Dehydrohalogenation: Dibromoethane on heating with alcoholic KOH undergoes dehydrohalogenation and gives acetylene.
2. From iodoform: Iodoform on heating with silver powder gives acetylene.
It undergoes addition with water forming acetaldehyde
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Methods of preparation of Acetylene are as preparation from calcium carbide and from vicinal dihalides.
Explanation:
Preparation from calcium carbide:-
Ethyne is prepared by calcium carbide with water.
CaC₂+H₂O→Ca(OH)₂+C₂H₂
Preparation for from vicinal dihalides:-
Vicinal dihalides on treatment with alc.potassiumhydroxide.It undergoes dehydrohaogenation where one molecule of hydrogen is eliminated to formine moleculeof hydrogen.
Here one molecule of hydrogen is eliminated to form alkenyl chloride
It which treatment with sodalime gives alkyne.
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