The valence bond theory for complexes was put forward by

Options

A. Werner
B. de Broglie
C. H-Bethe
D. Linus Pauling

Explanation

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks about the scientist who proposed the valence bond theory for coordination complexes.

2. **Identifying the Scientist**: The valence bond theory was put forward by Linus Pauling. He is well-known for his contributions to the field of chemistry, particularly in bonding theories.

3. **Explaining Valence Bond Theory**: Valence bond theory explains how atoms bond together to form molecules. In the context of coordination compounds, it describes how ligands (which are electron donors) interact with a central metal atom (which acts as an electron acceptor).

4. **Describing Ligands and Central Metal Atom**: In coordination compounds, ligands donate pairs of electrons to the central metal atom, forming coordinate covalent bonds. This interaction is essential for the stability and structure of coordination complexes.

5. **Hybridization Concept**: The theory also discusses the hybridization of orbitals in the central metal atom, which allows for the formation of various geometries (such as octahedral, tetrahedral, and square planar) depending on the number and type of ligands attached.

6. **Conclusion**: The answer to the question is Linus Pauling, who proposed the valence bond theory, which is fundamental in understanding coordination chemistry.

**Final Answer**: The valence bond theory for complexes was put forward by Linus Pauling (Option D).

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