Alkenes react much more readily with electrophiles than alkanes do.
Which of the following statements correctly explains this difference in reactivity?
Alkenes are highly polar molecules, whereas alkanes are completely non-polar.
The carbon-carbon π\piπ bond in alkenes is weaker than a C−C\text{C}-\text{C}C−C σ\sigmaσ bond and has exposed electron density.
Alkanes contain only weak π\piπ bonds that require high activation energy to break.
The total bond enthalpy of a C=C\text{C}=\text{C}C=C double bond is less than that of a single C−C\text{C}-\text{C}C−C σ\sigmaσ bond.
