Which one of the following compounds would have the highest heat of hydrogenation?

Which one of the following compounds would have the highest heat of hydrogenation?
  1. $\mathrm{CH}_{2}=\mathrm{CH}_{2}$
  2. $\mathrm{CH}_{3}-\mathrm{CH}_{2}-\mathrm{CH}=\mathrm{CH}_{2}$
  3. $\mathrm{CH}_{3} \mathrm{CH}=\mathrm{CHCH}_{3}$
  4. $\left(\mathrm{CH}_{3}ight)_{2} \mathrm{C}=\mathrm{C}\left(\mathrm{CH}_{3}ight)_{2}$

Solution

The heat of hydrogenation of an alkene depends upon its stability. Higher the stability, lower the heat of hydrogenation. Since $\mathrm{CH}_{2}=\mathrm{CH}_{2}$ has no substituent, it is the least stable alkene and hence has the highest heat of hydrogenation

Asked in: JEE-TOPICTESTS-CHEMISTRY

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