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Physical Properties of Alkenes

Which one of ...

Question

Which one of the following compounds are not formed in the metal catalyzed thermal dehydrogenation of butane?

A

hydrogen gas

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B

cis-butene

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C

trans-butene

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D

1,2-butadiene

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Solution

The correct option is B 1,2-butadiene
Butane undergo metal catalyzed thermal dehydrogenation to form hydrogen gas, Cis-butene, Trans-butene but not 1,2-butadiene. Because 1,2-butadiene is a cumulated diene and it is highly unstable so it does not form.
$B u t a n e m e t a l / t h e r m a l d e h y d r o g e n a t i o n - ------------------ \to H_{2} + c i s - b u t e n e + t r a n s - b u t e n e$

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Similar questions

There are some compounds which are as follow:

1-phenyl-1-butene, 1-phenyl-2-butene, 2-phenyl-1-butene

Which of the following is the correct order for increasing order of reactivity for acid catalyzed hydration?

1) 1-phenyl-1-butene < 1-phenyl-2-butene < 2-phenyl-1-butene

2) 1-phenyl-2-butene < 1-phenyl-1-butene < 2-phenyl-1-butene

3) 2-phenyl-1-butene < 1-phenyl-2-butene < 1-phenyl-1-butene

Q. Which of the following compound on dehydrogenation gives a ketone?

There are some alkenes are given as follow:

2-methyl propene, cis-2-butene, trans-2-butene

Which of the following is the correct order for increasing order of reactivity for acid catalyzed hydration?

1) trans-2-butene< cis-2-butene < 2-methyl propene

2) cis-2-butene< trans-2-butene < 2-methyl propene

3) 2-methyl propene < trans-2-butene < cis-2-butene

Q. Which of the following are formed on addition reaction of DCI with 3-methyl-1-butene

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.

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