number of isomers possible for [Co(en)²Cl(NO²)]Cl are

To determine the number of isomers possible for [Co(en)²Cl(NO²)]Cl, we need to analyze the different ways in which the ligands can be arranged around the central cobalt (Co) atom.

1. Start by identifying the ligands present in the complex:

   • en: ethylenediamine
   • Cl: chloride
   • NO²: nitrite

2. Determine the coordination number of the central Co atom. In this case, it is 6 because there are six ligands attached to the Co atom.

3. Consider the different possible arrangements of the ligands around the central Co atom. The ligands can be arranged in different ways, resulting in different isomers. The possible arrangements include:

   a. Cis isomers: In cis isomers, two similar ligands are adjacent to each other.

   • [Co(en)²Cl(NO²)]Cl (cis-1)
   • [Co(NO²)Cl(en)²]Cl (cis-2)

   b. Trans isomers: In trans isomers, two similar ligands are opposite to each other.

   • [Co(en)²Cl(NO²)]Cl (trans-1)
   • [Co(NO²)Cl(en)²]Cl (trans-2)

4. Count the total number of isomers. In this case, we have four possible isomers: cis-1, cis-2, trans-1, and trans-2.

Therefore, the number of isomers possible for [Co(en)²Cl(NO²)]Cl is four.