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Hydrohalogenation of Alkenes

Which of the ...

Question

Which of the following has minimum heat of hydrogenation?

A

ethene

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B

Propene

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C

cis-2-butene

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D

trans-2-butene

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Solution

The correct option is A trans-2-butene
Solution:- (D) trans- $2$ -butene
As we know that greater the stability, smaller the heat evolved in hydrogenation.
Since trans- $2$ -butene is most stable among the given butenes, it has least heat of hydrogenation.

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2

-butene can be prepared by heating which of the following compounds with a strong acid?

Q. Out of cis-2 butene and trans-2-butene, which one has the lowest melting point ?

Q. Assertion :2-Butanol on heating with

H_{2} S O_{4}

gives 1-butene and 2-butene. Reason: Dehydration of 2-butanol follows Saytzeff rule.

Q. Assertion :Heat of hydrogenation of

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6 - α H

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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

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