The number of donar sites in mercapto, glycinato, diethylene triamine and `(EDTA)^(4-)` are :-

Options

A. 1,2,3,4
B. 1,2,3,6
C. 1,2,4,6
D. 1,2,2,6

Answer

To determine the number of donor sites in the ligands mercapto, glycinato, diethylene triamine, and EDTA, we will analyze each ligand step by step.

### Step 1: Analyze Mercapto
- **Structure**: Mercapto (or thiol) has the general formula R-SH. In this case, we consider the sulfur atom (S) as the donor site.
- **Donor Sites**: Sulfur has one lone pair of electrons that can be donated to a metal ion.
- **Conclusion**: Mercapto has **1 donor site**.

### Step 2: Analyze Glycinato
- **Structure**: Glycinato is derived from glycine, which has the structure NH2-CH2-COO-. In this case, the ligand can donate from both the nitrogen (N) and the oxygen (O) atoms.
- **Donor Sites**:
- Nitrogen has one lone pair that can be donated.
- The carboxylate oxygen (O) has one lone pair that can also be donated.
- **Conclusion**: Glycinato has **2 donor sites** (1 from N and 1 from O).

### Step 3: Analyze Diethylene Triamine
- **Structure**: Diethylene triamine (DETA) has the structure NH2-CH2-CH2-NH-CH2-CH2-NH2. It contains three nitrogen atoms.
- **Donor Sites**: Each nitrogen atom has one lone pair that can be donated.
- **Conclusion**: Diethylene triamine has **3 donor sites** (1 from each of the 3 nitrogen atoms).

### Step 4: Analyze EDTA
- **Structure**: EDTA (Ethylenediaminetetraacetic acid) has the structure with four carboxylate groups and two nitrogen atoms:
- CH2-COO-CH2-COO-CH2-COO-CH2-COO-.
- **Donor Sites**:
- Each of the four carboxylate oxygens (O) can donate one lone pair.
- Each of the two nitrogen atoms (N) can also donate one lone pair.
- **Conclusion**: EDTA has **6 donor sites** (4 from O and 2 from N).

### Final Summary of Donor Sites
- Mercapto: **1 donor site**
- Glycinato: **2 donor sites**
- Diethylene triamine: **3 donor sites**
- EDTA: **6 donor sites**

### Final Answer
The number of donor sites in mercapto, glycinato, diethylene triamine, and EDTA are **1, 2, 3, and 6**, respectively.

---