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Chemistry

Give the method of preparation of ethyne by: 1,2-dibromoethane.

Organic Chemistry

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Answer

When 1,2-dibromoethane [ethylene dibromide] is boiled with alcoholic potassium hydroxide, ethyne is formed.

C2H4Br2 ethylene dibromide+2KOHalcoholicboiling200°CC2H2ethyne+2KBr+2H2O\underset{\text{ ethylene dibromide}}{\text{C}2\text{H}4\text{Br}2} + \underset{\text{alcoholic}}{\text{2KOH}} \xrightarrow[\text{boiling}]{\text{200}\degree \text{C}} \underset{\text{ethyne}}{\text{C}2\text{H}2} + 2\text{KBr} + 2\text{H}2\text{O}

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