State True or false
The π-complexes are known for transition metals only

Answer

To determine whether the statement "The π-complexes are known for transition metals only" is true or false, we can analyze the characteristics of π-complexes and their relation to transition metals.

### Step-by-Step Solution:

1. **Understanding π-Complexes**:
- π-complexes are formed when ligands containing π-electrons interact with a metal center. This interaction involves the donation of electron density from the ligand to the metal.

2. **Characteristics of Transition Metals**:
- Transition metals have vacant d orbitals that allow them to accept electron pairs from ligands. This is crucial for the formation of π-complexes.

3. **Formation of π-Complexes**:
- Ligands such as alkenes (e.g., ethylene, C2H4) and aromatic compounds (e.g., benzene, C6H6) can form π-complexes with transition metals. The d orbitals of the metal can overlap with the π orbitals of the ligand.

4. **Dπ-Pπ Bonding**:
- The interaction between the d orbitals of the transition metal and the π orbitals of the ligand leads to the formation of Dπ-Pπ bonds, which are characteristic of π-complexes.

5. **Conclusion**:
- While π-complexes are predominantly associated with transition metals due to their ability to form these interactions, it is important to note that some non-transition metals can also form π-complexes under specific conditions. However, the statement claims that π-complexes are known for transition metals only, which is misleading.

6. **Final Answer**:
- Therefore, the statement "The π-complexes are known for transition metals only" is **False**.