Assertion. EDTA is a hexadentate ligand.
Reason. Denticity of a ligand is given by number of lone pairs donated to central atom by a ligand.

Options

A. If both assertion and reason are true, but reason is not the true explanation of the assertion
B. If both assertion and reason are true, but reason is not the true explanation of the assertion
C. If assertion is true, but reason is false
D. If both assertion and reason are false

Explanation

To analyze the assertion and reason provided in the question, we will break down the concepts involved step by step.

### Step 1: Understand the Assertion
The assertion states that "EDTA is a hexadentate ligand."

**Explanation**:
EDTA (Ethylenediaminetetraacetic acid) is indeed a hexadentate ligand. This means it can form six bonds with a central metal ion. The term 'hexadentate' comes from 'hexa' meaning six and 'dentate' referring to the number of donor atoms that can attach to the metal.

### Step 2: Understand the Reason
The reason given is "Denticity of a ligand is given by the number of lone pairs donated to the central atom by a ligand."

**Explanation**:
Denticity refers to the number of donor atoms in a ligand that can bond to a central metal atom. In the case of EDTA, it has four carboxylate groups (each donating one pair of electrons) and two amine groups (each donating one pair of electrons). Thus, it can donate a total of six pairs of electrons to the metal ion, confirming its classification as a hexadentate ligand.

### Step 3: Conclusion
Both the assertion and the reason are true. The assertion that EDTA is a hexadentate ligand is correct, and the reason provided accurately describes how denticity is determined.

### Final Answer:
- **Assertion**: True
- **Reason**: True
- **Conclusion**: Both the assertion and reason are correct.

---