select the correct statement set ? (1) Bis - (glycinato) Zinc (II) is optically active
(2) `[NiCl_4]^(2-) and [PtCl_4]^(2-)` differ in shapes
(3) `[Ni(CN)_4]^(2-)and [Ni(CO)_4]` have same magnetic moment
(4) Cis `[Co(NH_3)_2(en)_2]` cannot show optical activity

Options

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

Answer

To solve the question, we need to evaluate each of the statements provided and determine their correctness.

### Step-by-Step Solution:

1. **Evaluate Statement 1: "Bis-(glycinato) Zinc (II) is optically active."**
- Bis-(glycinato) Zinc (II) has a chelating ligand (glycinate) which binds to zinc through both nitrogen and oxygen. The structure is asymmetric due to the different donor atoms, leading to a lack of a plane of symmetry. Therefore, it can exist in non-superimposable mirror images, making it optically active.
- **Conclusion:** This statement is **correct**.

2. **Evaluate Statement 2: "[NiCl4]^(2-) and [PtCl4]^(2-) differ in shapes."**
- [NiCl4]^(2-) has a tetrahedral geometry because Ni(II) does not have a strong field ligand that would cause pairing of electrons. In contrast, [PtCl4]^(2-) has a square planar geometry due to the presence of strong field ligands (Cl-), which causes pairing of electrons in the d-orbitals.
- **Conclusion:** This statement is **correct**.

3. **Evaluate Statement 3: "[Ni(CN)4]^(2-) and [Ni(CO)4] have the same magnetic moment."**
- [Ni(CN)4]^(2-) is a strong field complex that leads to pairing of electrons, resulting in a diamagnetic species (magnetic moment = 0). On the other hand, [Ni(CO)4] is also a strong field ligand that causes pairing, resulting in a diamagnetic species as well. Thus, both complexes have the same magnetic moment (zero).
- **Conclusion:** This statement is **correct**.

4. **Evaluate Statement 4: "Cis [Co(NH3)2(en)2] cannot show optical activity."**
- In the case of cis [Co(NH3)2(en)2], the presence of two identical bidentate ligands (en) leads to a plane of symmetry. This symmetry means that the complex can be superimposed on its mirror image, indicating that it is not optically active.
- **Conclusion:** This statement is **correct**.

### Final Evaluation:
All four statements are correct. Therefore, the correct statement set is:

1. **Correct Statement Set:** (1), (2), (3), and (4) are all correct.