Isomerism in Coordination Compounds

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Isomerism in Coordination Compounds: Overview

This topic covers concepts, such as, Isomerism in Coordination Compounds, Structural Isomerism, Geometrical Isomerism with Two Different Unidentate Ligands & Structures of Geometrical and Optical Isomers etc.

Important Questions on Isomerism in Coordination Compounds

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Number of geometrical isomer of given compound will be:

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Among the following, a pair of resolvable configurational enantiomers is given by:

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How many minimum no. of C-atoms are required for position and geometrical isomerism in alkene?

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Which of the following compounds does exhibit stereoisomerism?

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Which of the following has largest number of isomers?

(R is alkyl group, en is ethylediamine).

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Geometrical isomerism is possible in?

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Why is geometrical isomerism not possible in tetrahedral complexes having two different types of undentate ligands coordinated with the central metal ion?

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Identify the isomer occur in the given ligand. _____ (Facial (fac) isomer/ Meridional (mer) isomer)

[Ma3b3 ] like [Co(NH3 )3 (NO2 )3 ]

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Define Facial (fac) isomer.

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If three donor atoms of the same ligands occupy adjacent positions at the corners of an octahedral face, we have the facial (fac) isomer.

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State the method to draw the different geometrical forms for a particular complex in octahedral geometry.

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State the method to draw the different geometrical forms for a particular complex in square planer geometry.

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_____ planar complexes do not show optical isomerism.

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Square planar complexes show optical isomerism.

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What is coordination isomerism in coordination compounds ?

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What is Structural isomerism How is it classified?

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Due to the presence of ambidentate ligands coordination compounds show isomerism. Palladium complexes of the type [Pd(C6H5)2(SCN)2] and [Pd(C6H5)2(NCS)2] are _____(linkage isomers/ionisation isomers)

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Number of stereoisomers possible for the octahedral complexes CoNH33Cl3 and Ni(en)2Cl2, respectively, are:

[en=1, 2-ethylenediamine]

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A metal complex having composition CrNH34IBr2, was isolated in two forms X and Y(Br is bromine and I is iodine).

(a) X reacts with AgNO3 and gives a pale yellow precipitate which is insoluble in NH4OH.

(b) Y reacts with AgNO3 and gives a yellow precipitate which is insoluble in NH4OH.

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The octahedral complex CoNH35SO4Cl exists in two isomeric forms X and Y. Isomer X reacts with AgNO3 to give a white precipitate, but does not react with BaCl2. Isomer Y gives white precipitate with BaCl2 but does not react with AgNO3