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Isomerisation of Alkynes

30.Mechanism ...

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30.Mechanism of formation of alkene by tertiary alcohol in presence of Copper .

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Q. As a method for the preparation of alkenes, a weakness in the acid-catalyzed dehydration of alcohols is that the initially formed alkenes (or mixture of alkenes) sometimes isomerizes under the condition of its formation. Write a stepwise mechanism showing how 2-methyl-1-butene might isomerize to 2-methyl-2-butene in the presence of sulphuric acid.

Q. The treatment of alkyl chlorides with aqueous

K O H

leads to the formation of alcohols but in the presence of alcoholic

K O H

, alkenes are major products. Explain.

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. For production of alkene, alcohol is heated in presence of:

Alkanes having tertiary H atom can be oxidized to alcohols in presence of:

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Isomerisation of Alkynes

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