Which of the following compounds can exhibit cis-trans isomerism?
A) [Fe(CO)5ONO]2+
B) [Fe(CO)3(NH3)3]3+
C) [Cu(CO)5Br]+
D) [Cr(H2O)4Br2]+
E) [Fe(NH3)6]2+
To determine which of the following compounds can exhibit cis-trans isomerism, let's analyze each compound:
A) [Fe(CO)5ONO]2+: This compound has a coordination number of 6. Since it has a coordination number of 6 and contains only one ligand, it cannot exhibit cis-trans isomerism because there are no other ligands to have different positions.
B) [Fe(CO)3(NH3)3]3+: This compound also has a coordination number of 6. However, it contains three ammine (NH3) ligands and three carbonyl (CO) ligands. Due to the presence of multiple types of ligands, this compound can exhibit cis-trans isomerism. The NH3 and CO ligands can occupy different positions (cis or trans) relative to each other.
C) [Cu(CO)5Br]+: This compound has a coordination number of 6 and contains one bromide (Br-) ligand and five carbonyl (CO) ligands. Similar to compound A, since there is only one type of ligand, there are no different positions to consider, so this compound cannot exhibit cis-trans isomerism.
D) [Cr(H2O)4Br2]+: This compound has a coordination number of 6. It contains four water (H2O) ligands and two bromide (Br-) ligands. Since there are two different ligands, it is possible for this compound to exhibit cis-trans isomerism. The water and bromide ligands can occupy different positions (cis or trans) relative to each other.
E) [Fe(NH3)6]2+: This compound has a coordination number of 6 and contains six ammine (NH3) ligands. Similar to compounds A and C, there is only one type of ligand, so there are no different positions to consider, and this compound cannot exhibit cis-trans isomerism.
Based on the analysis above, the compounds that can exhibit cis-trans isomerism are:
B) [Fe(CO)3(NH3)3]3+
D) [Cr(H2O)4Br2]+
Answer: B and D
To determine which of the given compounds can exhibit cis-trans isomerism, we need to examine the compounds' structures and identify any groups that can have different spatial arrangements.
Let's consider each compound:
A) [Fe(CO)5ONO]2+
The compound contains only a single coordination complex, and it does not have any groups that can have different spatial arrangements. Therefore, it cannot exhibit cis-trans isomerism.
B) [Fe(CO)3(NH3)3]3+
The compound has a central iron (Fe) atom surrounded by three ammonia (NH3) ligands and three carbonyl (CO) ligands. Since both ammonia and carbonyl ligands are monodentate and can only bind through a single donor atom, there can be no cis-trans isomerism in this compound.
C) [Cu(CO)5Br]+
The compound has a central copper (Cu) atom surrounded by five carbonyl (CO) ligands and one bromide (Br) ligand. The carbonyl ligands are capable of binding through two donor atoms (the carbon atom and the oxygen atom). Hence, there can be cis-trans isomerism due to the different spatial arrangements of the carbonyl ligands.
D) [Cr(H2O)4Br2]+
The compound has a central chromium (Cr) atom surrounded by four water (H2O) ligands and two bromide (Br) ligands. The water ligands are capable of binding through two donor atoms (the hydrogen atom and the oxygen atom). Therefore, cis-trans isomerism is not possible in this compound.
E) [Fe(NH3)6]2+
The compound has a central iron (Fe) atom surrounded by six ammonia (NH3) ligands. As mentioned earlier, ammonia ligands cannot exhibit cis-trans isomerism.
Based on the above analysis, the only compound that can exhibit cis-trans isomerism is C) [Cu(CO)5Br]+.
Here is a site where you can obtain some information.
http://en.wikipedia.org/wiki/Coordination_complex
You really need to learn to do this yourself; I'm not inclined to give you all of the answers. Perhaps I can explain if you have some specific problem. Note that the internet is not conducive to drawing structures (at least not on this site).