Question

Tetrahedral complexes of the types of $\left[ Ma _{4}\right]$ and $\left[ Ma _{3} b \right]$ (here $M =$ Metal, $a , b =$ Achiral ligands) are not able to show optical isomerism because

• A. these molecules/ions have non super imposable mirror images
• B. these molecules possess a centre of symmetry
• C. these molecules/ions possess a plane of symmetry and hence are achiral
• D. these molecules/ions possess $C_{n}$ axis of symmetry

Answer 1

Answer: (C)

Symmetry plane divides the molecule in two halves such that one half is the mirror of the other.