Coordination CompoundHard

Question

A complex compound of one cobalt (III) ion, two ′en′ molecules, two chloride ions and one nitrite ion will show:

Options

A.linkage isomerism
B.ionisation isomerism
C.geometrical isomerism
D.optical isomerism.

Solution

Complex must be having the composition Co(Cl)2(en)2(NO2) i.e. [CoCl2 (en)2] NO2 or [CoCl (en)2NO2]Cl
(i) Linkage ; NO2 can link through N as well as through O
(ii) Ionisation : [Co(en)2Cl2]NO2 and [Co(en)2Cl (NO2)]Cl
(iii) It may exist as cis and trans isomers.
(iv) Its cis form lacks plane of symmetry as well as centre of symmetry and thus optically active.

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