Multiple choice

Geometrical isomerism is not shown by the compounds having coordination number

  1. 2, 3 and 4 (Tetrahedral only).

  2. 2, 4 (Tetrahedral only) and 6.

  3. 2, 3 and 4 (Square planar only).

  4. 2, 4 (Tetrahedral and square planar).
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A Correct answer
Explanation

Geometrical isomerism requires restricted ligand arrangement with cis/trans positioning. Tetrahedral complexes (CN=4) never show it because all ligands are adjacent. Linear (CN=2) and trigonal planar (CN=3) geometries lack the spatial arrangement needed. Square planar (CN=4) and octahedral (CN=6) complexes do show geometrical isomerism.

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