STATEMENT-1: Tetrahedral complexes are always high spin complexes .
STATEMENT-2: Crystal field splitting energy in tetrahedral complexes is 2/3 of the `Delta_(0)` (crystal field splitting energy in octahedral complexes).
STATEMENT-3: Tetrahedral complex `[MABCD]^(pm n)` is optically active .

Options

A. TTT
B. TFT
C. FTF
D. TTF

Answer

To analyze the given statements, we will evaluate each statement one by one based on our understanding of coordination compounds and crystal field theory.

### Step-by-Step Solution:

**Statement 1:** Tetrahedral complexes are always high spin complexes.

- **Explanation:** In tetrahedral complexes, the crystal field splitting energy (Δ_t) is relatively small compared to octahedral complexes. Because of this small splitting, the energy required to pair up electrons is greater than the energy gained by placing them in the higher energy orbitals. Thus, electrons tend to remain unpaired, leading to high spin configurations. Therefore, this statement is **True**.

---

**Statement 2:** Crystal field splitting energy in tetrahedral complexes is 2/3 of the Δ₀ (crystal field splitting energy in octahedral complexes).

- **Explanation:** The crystal field splitting energy (Δ_t) in tetrahedral complexes is actually approximately 4/9 of Δ₀, not 2/3. This means that the statement is incorrect. Therefore, this statement is **False**.

---

**Statement 3:** Tetrahedral complex [MABCD]^(pm n) is optically active.

- **Explanation:** A tetrahedral complex with four different ligands (A, B, C, D) will not have a plane of symmetry and will be non-superimposable on its mirror image. This characteristic makes it optically active. Therefore, this statement is **True**.

---

### Summary of Statements:
- **Statement 1:** True
- **Statement 2:** False
- **Statement 3:** True

Thus, the overall evaluation of the statements is: **True, False, True**.