CBSE Class 12 · 2011 · All India · Coordination CompoundsShort Answer

Write the structures and names of all the stereoisomers of the following compounds:
i) [Co(en)

_{3}

]Cl

_{3}

ii) [Pt(NH

_{3}

)

_{2}

_{2}

]
iii) [Fe(NH

_{3}

)

_{4}

_{2}

]Cl

Solution

(i) [Co(en)

_{3}

]Cl

_{3}

— tris(ethane-1,2-diamine)cobalt(III) chloride: the tris-chelate cation is chiral; \textbf{two optical isomers} (d- and l-), drawn as mirror-image octahedra.
(ii) [Pt(NH

_{3}

)

_{2}

_{2}

] — square planar MA

_{2}

_{2}

: \textbf{cis-} and \textbf{trans-diamminedichloridoplatinum(II)} (Cl's at 90° vs 180°).
(iii) [Fe(NH

_{3}

)

_{4}

_{2}

]Cl — octahedral MA

_{4}

_{2}

: \textbf{cis-} and \textbf{trans-tetraamminedichloridoiron(III) chloride}.

CBSE Class 12 Board · 2011 · All India · Subjective

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