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Dehydrohalogenation for Alkenes

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Question

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

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Solution

When 1,2 -dibromoethane is boiled with alcoholic potassium hydroxide, ethyne is formed.

$C H_{2} B r - C H_{2} B r + K O H B o i l i n g - --- \to C H \equiv C H + 2 K B r + 2 H_{2} O$

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Q. Give chemical equation for:
(a) The laboratory preparation of methane from sodium acetate.
(b) The reaction of one mole of ethene with one mole of chlorine gas.
(c) The preparation of ethyne from 1, 2-dibromoethane.

The balance chemical equations for the following :

The preparation of ethyne from 1, 2 - dibromoethane.

Q. Give the type of isomerism exhibited by each of the following pairs 1, 1-Dibromoethane and 1,2- dibromoethane?

Q. On heating in the presence of zinc and alcoholic solution, 1,2-dibromoethane gives:

Q. Ethylene reacts with

B r_{2}

1, 2 - dibromoethane

. The anti addition takes place due to the formation of which intermediate?

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