We are asked **which are identical to (1) and which are the geometric isomers of (1).**

Rotating the structures will show us that it is identical to (1):

**Rotating (3) about the vertical axis by 180° will make it look like (1):**

**Rotating (3) about the vertical axis by 90° will make it look like (1):**

There are two geometric isomers of octahedral complexes of the type MA3X3 (Figure 1), where M is a metal and A and X are monodentate ligands.

Of the complexes shown here, which are identical to (1) and which are the geometric isomers of (1)?

Complex 2, Complex 3, Complex 4, Complex 5.

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