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Introduction to Alkenes

Identify the ...

Question

Identify the alkene with the lowest molar heat of hydrogenation.

A

ethene

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B

2, 3

-dimethyl-

1

-butene

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C

propene

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D

2, 3

-dimethyl-

2

-butene

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Solution

The correct option is D $2, 3$ -dimethyl- $2$ -butene
More substituted alkene is more stable towards catalytic hydrogenation and it produces less heat. So 2,3-dimethyl-2-butene produces lowest molar heat of hydrogenation.

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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

When 3, 3-dimethyl-2-butanol is heated with $H_{2} S O_{4}$ the major product obtained is

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

2, 3

2

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

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