Question

Which of the following options is true?

• A. $\left[Cr\right(en{)}_3]C{l}_3$ is a chiral molecule
• B. $K_3\left[Cr\right(Br{)}_3\left(Cl{)}_3\right]$ is a chiral molecule
• C. $\left[Pt\right(H_{2}O\left)\right(N{H}_3\left)\right(Br\left)\right(Cl\left)\right]$ is a chiral molecule
• D. $cis-\left[Co\right(N{H}_3{)}_{4}B{r}_2]N{O}_3$ is a chiral molecule

Answer 1

The correct option is A $\left[Cr\right(en{)}_3]C{l}_3$ is a chiral molecule

Complexes which have a plane of symmetry will be optically inactive. Only (a) lacks symmetry, and hence it will be chiral i.e. shows optical activity.