Chemistry - Hydrocarbon Question with Solution | TestHub

The stability of an alkene increases with the number of alkyl groups attached to the double-bonded carbon atoms due to hyperconjugation and the +I effect.

The order of stability of alkenes based on substitution is:
Tetrasubstituted $>$ Trisubstituted $>$ Disubstituted $>$ Monosubstituted.

Among the given options, ${\text{R}}_2\text{C}={\text{CR}}_2$ is a tetrasubstituted alkene, having the maximum number of alkyl groups attached to the double bond. Thus, it has the maximum number of hyperconjugative structures and is the most highly stabilized alkene.

Answer: ${\text{R}}_2\text{C}={\text{CR}}_2$