Which of the following statements regarding the molecule ${\mathrm{CH}}_2=\mathrm{C}={\mathrm{CH}}_2$is not correct? 

Both the two $\mathrm{\pi }$-bonds are present in the same plane

The central carbon atom is sp hybridized while the terminal atoms are sp² hybridized

The molecule is linear

The molecule contains six $\sigma$ bonds and two $\mathrm{\pi }$ bonds