Question
Out of the following two coordination entities which is chiral (optically active)?
(a) cis-[CrCl2(ox)2]3+
(b) [trans-[CrCl2 (ox)2]3–
Solution
The two entities are represented as

Fig. Coordination entities.
Out of the two (a) cis-[CrCl2(OX)2]3– is chiral (optically active).

Fig. Coordination entities.
Out of the two (a) cis-[CrCl2(OX)2]3– is chiral (optically active).