Outline the reaction sequence for the conversion of ethene to ethyne (the number of steps should not be more than two).

A : H O C l

B: KOH

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A: Bromine water B: Diethyl amine

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A: Cl

_{2}, h ν

B: Ca(OH)

_{2}

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A: Bromine water

B : K O H

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Solution

The correct option is D A: Bromine water $B : K O H$
With bromine water the alkene undergoes bromination and form $D i b r o m o e t h a n e$ that on reaction with $K O H$ forms $e t h y n e$ by dehydrohalogenation reaction.

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Similar questions

Q. State whether the following statements are True or False :

Bromine water can be used to distinguish ethyne and ethene.

Q. Give the reactions of ethyne with
(a) Hydrogen
(b) Water
(c) Bromine

Explain why ethene decolourises bromine water whereas ethane does not.

Q. (i) Write the equation for the laboratory preparation of ethyne (acetylene) from calcium carbide.
(ii) What is the special feature of the structure of ethyne?
(iii) What would you see when ethyne is bubbled through a solution of bromine in carbon tetrachloride?
(iv) Name the addition product formed between ethene and water.

(a) Write an equation for the laboratory preparation of
(i) an unsaturated hydrocarbon from calcium carbide. (ii) an alcohol from ethyl bromide.
(b) What would you see, when ethyne is bubbled through a solution of bromine in carbon tetrachloride ?
(c) Name the addition product formed between ethene and water.

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Outline the reaction sequence for the conversion of ethene to ethyne (the number of steps should not be more than two).

The correct option is D A: Bromine water B:KOHWith bromine water the alkene undergoes bromination and form Dibromoethane that on reaction with KOH forms ethyne by dehydrohalogenation reaction.

The correct option is D A: Bromine water $B : K O H$
With bromine water the alkene undergoes bromination and form $D i b r o m o e t h a n e$ that on reaction with $K O H$ forms $e t h y n e$ by dehydrohalogenation reaction.