Question

Most Stable ...


Rank the alkenes below from most stable to least stable.

Transcribed: Most Stable trans-hept-2-ene 2 2,3-dimethylpent-2-ene 3-ethylpent-2-ene 2-methylhex-1-ene hept-1-ene cis-hept-2-ene Least Stable

Answer

The hydrocarbons having at least one double bond are known as alkene.

Long-chain alkenes are more stable than short-chain alkenes.

 

 

 

 

The stability of alkene is dependent on hydration energy( heat of hydrogenation).

Hydration energy is the energy that is associated with solvation.

If the hydration energy of an alkene molecule is lower then the alkene molecule is more stable,

and If the hydration energy of an alkene is high then the alkene is less stable.

The stability of alkene is also dependent on substituents.

If the alkene is more substituted then it is more stable,

and if the alkene is less substituted the alkene is less stable.

and for any acyclic molecules, trans isomers are more stable than cis isomers,

Therefore for given alkenes, as they are acyclic the trans-hept -2-ene is more stable than the cis-2-hept-ene.

By considering all factors which are affecting the stability of alkene,

the correct order for the stability of alkene from most stable to least stable is -

 

most stablehept-1-enetrans-hept-2-enecis-hept-2-ene2-methylhex-1-ene2,3-dimethylpent-2-ene3-ethylpent-2-eneleast stable

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