$(A)$ It has two geometrical isomers
$(B)$ It will have three geometrical isomers if bidentate 'en' is replaced by two cyanide ligands
$(C)$ It is paramagnetic
$(D)$ It absorbs light at longer wavelength as compared to $\left[ Co ( en )\left( NH _3\right)_4\right]^{3+}$
(image)
$\left[ Co \left( NH _3\right)_3\left( H _2 O \right)( CN )_2\right]^{+}$has three geometrical isomers.
(image)
${\left[ Co ( en )\left( NH _3\right)_3\left( H _2 O \right)\right]^{+3} \text { is diamagnetic }}$
Co $=[ Ar ]_{18} 4 s ^2 3 d ^7$
Co $^{+3}=[ Ar ]_{18} 3 d ^6$
en is strong field ligand.
(image)
${\left[ Co ( en )\left( NH _3\right)_3\left( H _2 O \right)\right]^{+3}} -\quad-\Delta_0$
${\left[ Co \text { (en) }\left( NH _3\right)_4\right]^{+4}}$
$\Delta_0=\frac{ hc }{\lambda}$
$\therefore \Delta_0 \propto \frac{1}{\lambda}$
$[Co (en)$ $\left.\left( NH _3\right)_3\left( H _2 O \right)\right]^{+3}$ absorbs light at longer wavelength as compared to $[ Co ( en )$ $\left.\left( NH _3\right)_4\right]^{+3}$
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$(a)$ They might be configurational isomers $(b)$ They might be diastereomers
$(c)$ They might be constitutional isomers $(d)$ They might be tautomers
$(e)$ They might be conformational isomers $(f)$ They might be enantiomers
$(g)$ They might be positional isomers
