Which of the following statements is/are correct?a)Geometrical isomeri...
Geometrical isomerism is not observed in complexes of coordination number 4 having tetrahedral geometry. The platinumglycinato complex [ Pt(gly)2 show geometrical isomerism (cis and trans form).
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Which of the following statements is/are correct?a)Geometrical isomeri...
**Geometrical Isomerism in Complexes**
Geometrical isomerism is a type of stereoisomerism observed in coordination complexes. It occurs when different spatial arrangements of ligands around a metal ion result in different isomers. In this question, we are given four statements and we have to determine which of them are correct.
**a) Geometrical isomerism is not observed in complexes of CN4 having tetrahedral geometry**
In a tetrahedral geometry, the ligands are arranged around the metal ion in a symmetrical manner, with bond angles of approximately 109.5°. This symmetry does not allow for the possibility of different spatial arrangements of ligands, which is a requirement for geometrical isomerism. Therefore, statement a) is correct.
**b) Square planar complexes with CN4 and CN6 generally show geometrical isomerism**
In square planar complexes, the ligands are arranged in a square plane around the metal ion. This arrangement provides the possibility for different spatial arrangements of ligands, leading to geometrical isomerism. Therefore, statement b) is incorrect. Geometrical isomerism is not generally observed in square planar complexes with CN4 or CN6 ligands.
**c) Square planar complexes with Ma3b or Mab3 exhibit cis-trans isomerism**
Cis-trans isomerism, also known as geometric isomerism, is a type of stereoisomerism observed when two ligands are located in adjacent positions in a coordination complex. In square planar complexes with the formula Ma3b or Mab3, the ligands are arranged in such a way that cis-trans isomerism is possible. Therefore, statement c) is correct.
**d) The platinumglycinato complex [Pt(gly)2] shows geometrical isomerism**
The platinumglycinato complex [Pt(gly)2] contains two glycinato ligands coordinated to a central platinum ion. The glycinato ligand is bidentate, meaning it can coordinate through two different atoms. This allows for the possibility of different spatial arrangements of the ligands around the platinum ion, leading to geometrical isomerism. Therefore, statement d) is correct.
**Conclusion**
Based on the explanations provided above, the correct statements are a) Geometrical isomerism is not observed in complexes of CN4 having tetrahedral geometry and d) The platinumglycinato complex [Pt(gly)2] shows geometrical isomerism.