Question

If there are five electron pairs in outer shell, then structure and bond angle as predicted by Sidgwick-Powell theory is:

• A. octahedron, ${90}^0$
• B. trigonal bipyramidal, ${120}^0$ and ${90}^0$
• C. pentagonal bipyramidal, ${72}^0$ and ${90}^0$
• D. tetrahedron, ${109}^0{28}^{\prime }$

Answer 1

The correct option is B trigonal bipyramidal, ${120}^0$ and ${90}^0$

With 5 electron pairs, the shape is trigonal bipyramidal with three bonds in the trigonal plane and 2 bonds in the pyramid i.e., perpendicular to the plane which are above and below the plane.