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NEET CHEMISTRYCoordination CompoundsMedium

Question

The number of geometrical isomers shown by [Pt(Py)(NH₃)BrCl] is:

A

4

B

0

C

2

D

3

Step-by-Step Solution

The complex [Pt(Py)(NH3)BrCl][Pt(Py)(NH_3)BrCl] is a square planar complex of the type [Mabcd][Mabcd], where the central metal ion (Pt) is coordinated to four different monodentate ligands (Py, NH3NH_3, Br, Cl).

According to coordination chemistry principles found in NCERT:

  1. Geometry: Platinum(II) forms square planar complexes.
  2. Isomerism: For a square planar complex of the type [Mabcd][Mabcd], there are 3 possible geometrical isomers. These are obtained by fixing the position of one ligand (say, Py) and placing the other three ligands (NH3NH_3, Br, Cl) trans (opposite) to it sequentially. Isomer 1: Py is trans to NH3NH_3. Isomer 2: Py is trans to Br.
  • Isomer 3: Py is trans to Cl.

Therefore, the number of geometrical isomers is 3 .

Exam Context & Concepts Covered

This question aligns with the NEET CHEMISTRY syllabus, specifically targeting concepts from Coordination Compounds. Mastering this topic is crucial for scoring well in the upcoming medical entrance examinations. Solving conceptually related problems will help you understand the nuances of these concepts and improve your problem-solving speed.

CHEMISTRYCoordination Compoundsnumbergeometricalisomersptpynhbrcl

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