JEE Main Chemistry question
How many of the following are optically inactive? i. *trans*-[Co(en)_2(NH_3)Cl]^{2+} ii. *cis*- iii. *cis*- iv. *trans*- v. *trans*-
Answer: $4$
Solution
(i), (iv) and (v), being *trans* isomers of /-type complexes, retain a mirror plane — achiral. (iii), a facial-type isomer,
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