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Question

Which of the following has maximum number of geometrical isomers ?


A

CoNH34Cl2

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B

NiC2O4en2

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C

CrSCN2NH342+

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Solution

The correct option is C

CrSCN2NH342+


The explanation for the correct answer

(C) CrSCN2NH342+

  1. CrSCN2NH342+ has maximum isomers structures as it can show linkage isomerism, geometrical isomerism and optical isomerism.
  2. Linkage isomerism is due to the presence of an ambidient ligand SCN which can attack either from -SCN side or -NCS side.
  3. Geometrical isomerism can exhibit Cis as well as trans isomers. When SCN on same side it is cis isomer and when on opposite site it is trans isomer.
  4. In optical isomerism it may be D or L isomers.
  5. Thus, CrSCN2NH342+has maximum number of isomers.

The explanation for the incorrect answers

(A) CoNH34Cl2

  1. It can show only geometrical isomers that is cis and trans isomer.
  2. When the Cl present on same side it show cis isomerism whereas if Cl is present on opposite side it shows trans isomerism.
  3. Thus, it shows only two possible isomers.
  4. Thus, it is an incorrect answer.

(B) NiC2O4en2

  1. NiC2O4en2 shows optical isomerism.
  2. It has two isomers D and L isomers,
  3. Thus, it is also an incorrect answer.

Thus, CrSCN2NH342+ has maximum number of isomers. Therefore, option C is correct.


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