Complex ion/compound having only two stereoisomers :

A
$[{CrBr}_{2} (H_{2} O) {({NH}_{3})}_{3}]$
B
$[{Zn(gly)}_{2}]$
C
${[PtBrCl (CN) (H_{2} O)]}^{-}$
D
${[Co (en) {({NH}_{3})}_{4}]}^{3 +}$

Solution:

$[{CrBr}_{2} (H_{2} O) {({NH}_{3})}_{3}]; No. of stereoisomers = 3, cis = 1 trans = 2 [Zn (gly)_{2}] : No. of stereoisomers = 2, both are in d and I forms [PBrCl (CN) (H_{2} O)]^{-} . No. of stereoisomers = 3, all are geometrical isomers {[Co (en) {({NH}_{2})}_{4}]}^{3 +}; No. of stereoisomers = 0$

Solution:

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