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Chemistry

State the conditions required for :

(i) Catalytic hydrogenation of ethyne.

(ii) Preparation of ethyne from ethylene dibromide.

Organic Chemistry

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Answer

(i) Vapours of ethyne mixed with hydrogen are passed over a catalyst eg., nickle [Pd. or Pt.] at high temperatures of around 300°C.

(ii) Ethylene dibromide is boiled with conc. alcoholic KOH soln. in a round bottom flask. Ethyne is collected by downward displacement of water.

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