CBSE Class 12 · 2003 · All India Compartment · Coordination CompoundsShort Answer

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Answer the following:
a) Differentiate between a bidentate ligand and a monodentate ligand.
b) Write the IUPAC name of [Pt(NH

_{3}

)

_{4}

_{2}

]Cl

_{2}

.
c) Draw the structures of the geometrical isomers of [Co(NH

_{3}

)

_{4}

_{2}

]

^{+}

Solution

(a) A monodentate ligand coordinates through a single donor atom (H

_{2}

O, NH

_{3}

, Cl

^{-}

); a bidentate ligand holds the metal through two donor atoms simultaneously, forming a chelate ring (ethane-1,2-diamine, oxalate).
(b) 2(−1) + x = +2 ⇒ Pt(IV):
\textbf{tetraamminedichloridoplatinum(IV) chloride}
(c) Octahedral MA

_{4}

_{2}

:
\textit{cis} — the two Cl

^{-}

on adjacent corners (90° apart), four NH

_{3}

at the rest;
\textit{trans} — the two Cl

^{-}

on opposite corners (180°), the four NH

_{3}

in the square plane.

CBSE Class 12 Board · 2003 · All India Compartment · Subjective

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CBSE Class 12 · 2003 · All India Compartment · Coordination CompoundsShort Answer

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