Coordination Compounds 1 Question 9
####9. Which one of the following complexes shows optical isomerism?
(2016 Main )
(a) cis $\left[Co(en) _2 Cl _2\right] Cl$
(b) trans $\left[Co(en) _2 Cl _2\right] Cl$
(c) $\left[Co\left(NH _3\right) _4 Cl _2\right] Cl$
(d) $\left[Co\left(NH _3\right) _3 Cl _3\right]$
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Answer:
Correct Answer: 9. (c)
Solution:
$\left[Co\left(NH _3\right) _4 Cl _2\right] Cl$ can exist in both cis and trans forms that are given below:
trans- $\left[Co\left(NH _3\right) _4 Cl _2\right] Cl$ (optically inactive)
cis- $\left[Co\left(NH _3\right) _4 Cl _2\right] Cl$ (optically inactive) $\left[Co\left(NH _3\right) _3 Cl _3\right]$ exists in fac and mer-isomeric forms and both are optically inactive.
fac-isomer (optically inactive)
mer-isomer (optically inactive)
