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Which of the following dienes undergoes ...

Which of the following dienes undergoes the least exothermic hydrogenation upon treatment with `H_2`/Pd

A

2

B

4

C

3

D

1

Text Solution

Verified by Experts

The correct Answer is:
D
The enhanced stability of a conjugated diene compared to a non-conjugated diene imparts it with a lower heat of hydrogenation (this is only valid when the alkenes being compared undergo hydrogenation to give the same alkane). This is the only conjugated diene shown
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AAKASH SERIES-HYDROCARBONS-ADDITIONAL PRACTICE SHEET ( LEVEL-I (LECTURE SHEET (MAIN) (STRAIGHT OBJECTIVE TYPE QUESTIONS)))
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  2. Which of the following arrangements of p orbitals gives the lowest ene...

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  3. Which of the following dienes undergoes the least exothermic hydrogena...

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  12. CH4 + Cl2 overset(hv)to CH3 Cl + HCl to obtain high yields of CH3Cl , ...

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  18. compare the stabilities of the fallowing two compounds (A) and( B) A...

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  19. Which conformation of ethane has the lowest potential energy?

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