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Hydrogenation of Alkynes

For the given...

Question

For the given reaction :
$C a C_{2} + 2 H_{2} O Δ ⟶ A Red hot Fe tube - -------- \to B Major$
The major product B is :

A

Toluene

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B

Ethylbenzene

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C

Butyne

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D

Benzene

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Solution

The correct option is D Benzene
Industrial preperation of ethyne :
$C a C_{2} + 2 H_{2} O Δ ⟶ C a (O H)_{2} + C_{2} H_{2} Ethyne$
Cyclic Polymerisation:
The process in which the repeating units are joined together end to end in a cyclic chain.This is the best route for
entering aromatic compounds from aliphatic compounds.
Ethyne on passing through a red hot iron tube at 873 K undergoes cyclic polymerisation to produce one molecule of benzene.

Three molecules of ethyne polymerise to give benzene.

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Hydrogenation of Alkynes

Standard XII Chemistry

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