Possible isomerism in complexes CoNH33NO23 and CoNH35NO2Cl2, respectively are:

A
linkage and optical
B
geometrical and linkage
C
optical and ionization
D
linkage and geometrical

Solution:

$[Co {({NH}_{3})}_{3} {({NO}_{2})}_{3}] {Cl}_{2} complex exhibits geometrical isomerism (G.I.)$
Geometrical isomers = 2 (l cis + 1 trans)
Optical isomers = 0
Space isomers = 2
$[Co {({NH}_{3})}_{5} {NO}_{2}] {Cl}_{2} complex shows linkage and ionization isomerism.$

Possible isomerism in complexes $[Co {({NH}_{3})}_{3} {({NO}_{2})}_{3}] and [Co {({NH}_{3})}_{5} ({NO}_{2})] {Cl}_{2},$ respectively are:

Solution:

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