Which complex compound will give four isomers:
\([Fe(en)_3]Cl_3\)
\([Co(en)_2Cl_2]Cl\)
\([Fe(PPh_3)_3NH_3ClBr]Cl\)
\([Co(PPh_3)_3Cl]Cl_3\)
The Correct Option is C
Solution and Explanation
\([Fe(PPh_3)_3NH_3ClBr]Cl\) contains different ligands (\(NH_3\), \(Cl\), and \(Br\)) and phosphine ligands (\(PPh_3\)). The different arrangements of these ligands around the central \(Fe\) atom can result in various isomers. In this case, you can have geometric (cis-trans) isomers due to the presence of both cis and trans configurations of \(Cl\) and \(Br\) ligands with respect to each other, leading to two isomers. Additionally, you can have optical isomers (enantiomers) because of the chiral nature of the \(PPh_3\) ligands, which can give you another two isomers.
So, the correct option is (C): \([Fe(PPh_3)_3NH_3ClBr]Cl\)
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Concepts Used:
Coordination Compounds
A coordination compound holds a central metal atom or ion surrounded by various oppositely charged ions or neutral molecules. These molecules or ions are re-bonded to the metal atom or ion by a coordinate bond.
Coordination entity:
A coordination entity composes of a central metal atom or ion bonded to a fixed number of ions or molecules.
Ligands:
A molecule, ion, or group which is bonded to the metal atom or ion in a complex or coordination compound by a coordinate bond is commonly called a ligand. It may be either neutral, positively, or negatively charged.