False statement regarding the structure of SO₃ molecule violating octet rule is 

It contains 3 $\mathrm{\sigma }$ bonds

It contains 2 ${\mathrm{p}}_{\mathrm{\pi }}-{\mathrm{p}}_{\mathrm{\pi }}$bonds

It contains 2 ${\mathrm{p}}_{\mathrm{\pi }}-{\mathrm{d}}_{\mathrm{\pi }}$ bonds

It contains 1 ${\mathrm{p}}_{\mathrm{\pi }}-{\mathrm{p}}_{\mathrm{\pi }}$ bond