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 are trans-isomers?
A)isomers (1)and (2)
B)isomers (1)and (3)
C)isomers (2)and (4)
D)isomers (3)and (4)

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 are trans-isomers?
A)isomers (1)and (2) 
B)isomers (1)and (3) 
C)isomers (2)and (4) 
D)isomers (3)and (4)

Quizplus · Accepted Answer

To determine the trans-isomers, we need to identify which isomers have two ligands (molecules attached to the central Co atom) positioned opposite to each other. In isomers (2)and (4), the Br ligand is opposite to one of the NH₃ ligands, but not the other. In isomers (1) and (3), both NH₃ ligands are positioned opposite to each other, making them trans-isomers. Therefore, the best choice is C.

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

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