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Physical Properties of Alkenes

During free r...

Question

During free radical chlorination of isobutane, an alkene by-product is obtained via disprotionation of free radical intermediate What is this alkene?

A

1-butene

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B

2-butene

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C

2-methyl propene

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D

Both (b) and(c)

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Solution

The correct option is C 2-methyl propene
As shown in the above mechanism 1-butene and 2-butene cannot be formed by this free radical. release of 1 hydrogen radical gives 2-methyl propene as disproportionated product.

Hence, the correct option is C.

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Similar questions

Q. From the list of alkenes given below, identify the alkenes which on ozonolysis give only ketones.
(a) 2 methyl-1-butene
(b) 1-butene
(c) 2,3-dimethyl-2-butene
(d) 3-methyl-2-pentene
(e) 3,4-dimethyl-3- hexene
(f) 2,5-dimethyl-2,4-hexadiene

Q. From the list of alkenes given below, identify the alkenes which on reductive ozonolysis given only ketones.
(a) 2-methyl-1-butene
(b) 1-butene
(c) 2,3-dimethyl-2-butene
(d) 3-methyl-2-pentene
(e) 3,4-dimethyl-3-hexene
(f) 2,5-dimethyl-2,4-hexadiene

Q. The decreasing order of reactivity of the following alkenes is:
(i) 2,3-Dimethyl-2-butene
(ii) 2-Methyl-2-butene
(iii) 2-Butene
(iv) Ethene

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. 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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