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The order of heat of hydrogenation in fo...

The order of heat of hydrogenation in following compounds is:

A

`I lt II lt IV lt III`

B

`III lt IV lt II lt I`

C

`II lt III lt I lt IV`

D

`II gt IV gt I lt III`

Text Solution

Verified by Experts

The correct Answer is:
B
Heat of hydrogenation `prop1/("stability of alkene")`
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Knowledge Check

  • Arrange in increasing order of heat of hydrogenation of following dienes.

    A
    iiiltvltiltivltii
    B
    Vltiltivltiiltiii
    C
    iiigtvgtigtivgtii
    D
    iiigtvgtivgtigtii

  • Compared heat of hydrogenation of the following

    A
    `I gt II gt III`
    B
    `III gt II gt I`
    C
    `II gt III gt I`
    D
    `II gt I gt III`

  • The reactivity order towards hydrogenation of the following compounds is

    A
    `I gt II gt III gt IV`
    B
    `II gt III gt IV gt I`
    C
    `III gt IV gt II gt I`
    D
    `IV gt III gt II gt I`

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    The correct heat of hydrogenation order of

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    Hydrogenation of unsaturated hydrocarbons is an exothermic reaction. Due to hyperconjugation and resonance the stability of unsaturated hydrocarbons increases and the increase in stability is more due to resonance. Compound with same number of pi- bonds and more stability has lower heat of hydrogenation. Heat of formation is defined as the energy evolved when a molecule is formed from its atoms. For isomers the more stable compounds has higher heat of formation. The order of heat of formation of the following molecules is :

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