The compound`[CrCl_(2)(NH_(3))_(2)(en)]` can form .

Options

A. Geometrical isomers
B. Coordination isomers
C. Optical isomers
D. Linkage isomers

Answer

To determine the types of isomers that the compound \([CrCl_2(NH_3)_2(en)]\) can form, we will analyze its structure and the possibilities for geometric and optical isomerism.

### Step 1: Identify the Coordination Complex
The compound \([CrCl_2(NH_3)_2(en)]\) consists of chromium (Cr) as the central metal ion, with two chloride ions (Cl), two ammonia molecules (NH₃), and one ethylenediamine (en) ligand. Ethylenediamine is a bidentate ligand, meaning it can form two bonds with the metal ion.

### Step 2: Determine the Coordination Number
The coordination number of chromium in this complex is 6, which is typical for octahedral complexes. The ligands around the chromium will arrange themselves in an octahedral geometry.

### Step 3: Analyze Geometric Isomerism
In octahedral complexes, geometric isomerism can occur. The two types of geometric isomers are:
- **Cis Isomer**: where similar ligands are adjacent to each other.
- **Trans Isomer**: where similar ligands are opposite each other.

For \([CrCl_2(NH_3)_2(en)]\):
- **Cis Isomer**: The two NH₃ ligands can be adjacent to each other, while the two Cl ligands are also adjacent.
- **Trans Isomer**: The two NH₃ ligands can be opposite each other, while the two Cl ligands are also opposite.

### Step 4: Analyze Optical Isomerism
Optical isomerism occurs when a compound can exist in two forms that are mirror images of each other (enantiomers).
- The **cis isomer** of \([CrCl_2(NH_3)_2(en)]\) can be optically active because it lacks a plane of symmetry.
- The **trans isomer** is optically inactive due to the presence of a plane of symmetry.

### Conclusion
The compound \([CrCl_2(NH_3)_2(en)]\) can form:
- Two geometric isomers: cis and trans.
- The cis isomer is optically active and can exist in two enantiomeric forms.

### Final Answer
The compound \([CrCl_2(NH_3)_2(en)]\) can form two geometric isomers (cis and trans) and the cis isomer can exhibit optical isomerism.

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