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Introduction to Alkenes

Which has lea...

Question

Which has least heat of hydrogenation?

A

cis-2-butene

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B

trans-2-butene

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C

1,3-dimethyl-2-butene

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D

2-methyl propene

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Solution

The correct option is D 1,3-dimethyl-2-butene
1,3-dimethyl-2-butene or 2-methylpent-2-ene has the least heat of hydration.
The heat of hydration is inversely proportional to the stability of alkene.
The more substituted alkene is more substituted.
1,3-dimethyl-2-butene is more substituted and more stable. Hence, it has the least heat of hydrogenation.
1,3-dimethyl-2-butene is trisubstituted alkene whereas others are disubstituted alkenes.

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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

Q. Which isomerism relates 2-methyl-1-butene and 2-methyl-2-butene?

Q. When 3, 3-dimethyl-2-butanol is heated with

H_{2} S O_{4}

the major product obtained is

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