Chapter 16, Problem 16.12P

Using hybridization, predict how the bond length of the $\text{C}-\text{C}$ $\sigma$ bond in should compare with the $\text{C}-\text{C}$ $\sigma$ bond in ${\text{CH}}_{\text{3}}{\text{CH}}_{\text{3}}$ and ${\text{CH}}_{\text{2}}=\text{CH}-\text{CH}={\text{CH}}_{\text{2}}$.