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Hydrogenation of Alkynes

Trans-alkenes...

Question

Trans-alkenes are formed by the reduction of alkynes with:

A

S n / H C l

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B

H_{2} - P d / C, B a S O_{4}

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C

N a B H_{4}

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D

N a / l i q . N H_{3}

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Solution

The correct option is D $N a / l i q . N H_{3}$
$N a / l i q . N H_{3}$ reduces alkynes into trans alkenes via trans addition and is called the Birch reduction.

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Similar questions

Alkynes on reduction form trans alkenes in presence of:

In the conversion of alkyne to trans-alkene by Birch reduction using alkali metals (such as Na or K) in liquid

N H_{3}

and alcohol (MeOH or EtOH).
the mechanism takes place in the formation of intermediate species in the following sequence

Q. In the reaction,
source of two H atoms which are added to alkyne to give trans-alkene is

Q. Statement-I : Alkynes are more reactive than alkenes towards electrophilic reagents like

H^{+}

.
Because
Statement-II : The alkyl carbocation formed from alkene is more stable than the vinyl carbocation formed from alkyne.

Q. Assertion :Alkenes and alkynes are more reactive than alkanes. Reason: Alkenes and alkynes possess multiple bonds.

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