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The order of heat of hydrogenation in fo...

The order of heat of hydrogenation in following compounds is:

A

`IltIIltIVltIII`

B

`IIIltIVltIIltI`

C

`IIltIIIltIltIV`

D

`IIltIVltIltIII`

Text Solution

Verified by Experts

The correct Answer is:
B
`"Heat of hydrogenation"prop(1)/("stability of alkene")`.
(III & IV have both resonance and hypercojugation where as I and II have only hyperconjugation.)
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RESONANCE-GENERAL ORGANIC CHEMISTRY-I-PRACTICE TEST-1
  1. Which of the following compound is non aromatic :

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  2. Which compound has least e^(-) density in benzene ring

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  3. The order of heat of hydrogenation in following compounds is:

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  4. Resonance stabilized cation is:

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  5. In an anion HCOO^- the two carbon-oxygen bonds are found to be equal l...

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  6. Compare C-N bond length in the following :

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  7. Which of the following is false for order of -l effect :

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  8. underset("x")(H-N=C=O)harrunderset("y")(H-overset(o+)N-=C-overset(Thet...

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  9. The aromatic compound would be :

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  10. Number of delocalized e^(-) pairs in squaric acid and dianion of squar...

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  11. Which of the following benzene ring has greater electron density than ...

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  12. Which of the following has the miximum number of resonating structure ...

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  13. Among the following aromatic compound is

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  14. overset(Theta)overset(..)CH(2)-underset(O)underset(||)C-CH(3) and CH(2...

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  15. Which is not stable at room temperature ?

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  16. Correct order of stability of following alkenes is

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  17. All the carbon-carbon bond lengths are equal in

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  18. The kind of delocalization involving sigma bond orbitals is scalled

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  19. Which of the following has the highest dipole moment.

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  20. in C(1)-H, C(2)-H and C(3)-H the homolytic bond dissociation energy or...

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