Consider the following isomers of [Co(NH 3 ) 4 Br 2 ] + .The black sphere represents Co,gray spheres represent NH 3 ,and unshaded spheres represent Br.
-Which structures are identical?
A)None of the structures are identical.
B)structure (1)= structure (2)and structure (3)= structure (4)
C)structure (1)= structure (3)and structure (2)= structure (4)
D)structure (1)= structure (4)and structure (2)= structure (3)

Question

Consider the following isomers of [Co(NH 3 ) 4 Br 2 ] + .The black sphere represents Co,gray spheres represent NH 3 ,and unshaded spheres represent Br. 
-Which structures are identical?
A)None of the structures are identical. 
B)structure (1)= structure (2)and structure (3)= structure (4) 
C)structure (1)= structure (3)and structure (2)= structure (4) 
D)structure (1)= structure (4)and structure (2)= structure (3)

Quizplus · Accepted Answer

In structure (1) and (3), the Co ion is bonded to two NH₃ ligands and one Br ligand in a triangular coordination geometry. The two remaining ₄ and ₂ ligands are bonded to the Co ion in a trans configuration. Therefore, structures (1) and (3) are identical. Similarly, in structure (2) and (4), the Co ion is bonded to two NH₃ ligands and one Br ligand in a triangular coordination geometry. The two remaining ₄ and ₂ ligands are bonded to the Co ion in a cis configuration. Therefore, structures (2) and (4) are identical. Hence, the answer is C - structure (1)= structure (3)and structure (2)= structure (4).

Consider the Following Isomers of [Co(NH3)4Br2]+

Consider the Following Isomers of [Co(NH₃)₄Br₂]⁺