Question

In $SO_{3}$ molecule, $3$ oxygen atoms are attached to sulphur atom through double bonds. Hence, the molecules consist $3 \pi$- bonds. The types of pi-bonds present in $SO_{3}$ molecule are

• A. All $p\pi-p \pi$ bonds
• B. one $p \pi-d \pi$ and two $p \pi-p \pi$ bonds
• C. one $p \pi- p \pi$ and one $p \pi-d \pi$ bonds
• D. two $p\pi-d \pi$ and one $p \pi-p \pi$ bonds

Answer 1

Answer: (D)

In gas phase, $SO_{3}$ molecule is triangular planar having $sp^{2}$-hybridisation of the S-atom. There are three sigma bonds formed by $sp^{2}-p$ overlap and three pi-bonds are by one $p \pi-p \pi$ overlap and two $p \pi-d \pi$ overlap