Statement -1 : `CHCl_(3)` is more acidic than `CHF_(3)`
Statement -2 : `overset(Theta)(C Cl_(3))` is stabilized through `p pi - dpi` back bonding

Options

A. Statement-1 is True , Statement-2 is True , Statement-2 is a correct explanation for Statement-1
B. Statement-1 is True , Statement-2 is True , Statement-2 is NOT a correct explanation for Statement-1
C. Statement-1 is True , Statement-2 is False
D. Statement-1 is False , Statement-2 is True

Answer

To solve the question, we need to analyze both statements regarding the acidity of CHCl3 and CHF3 and the stabilization of their conjugate bases.

### Step 1: Understanding Acidity
Acidity is determined by the stability of the conjugate base formed after the acid donates a proton (H⁺). The more stable the conjugate base, the stronger the acid.

### Step 2: Identify the Conjugate Bases
1. **For CHCl3**: When CHCl3 loses a proton, it forms CCl3⁻.
2. **For CHF3**: When CHF3 loses a proton, it forms CF3⁻.

### Step 3: Analyze the Stability of the Conjugate Bases
- **CCl3⁻**: The conjugate base CCl3⁻ has three chlorine atoms. Chlorine is less electronegative than fluorine, and it has vacant 3d orbitals. This allows for p-pi-d-pi back bonding, where the lone pair of electrons on carbon can be delocalized into the vacant d orbitals of chlorine. This delocalization increases the stability of CCl3⁻.

- **CF3⁻**: The conjugate base CF3⁻ has three fluorine atoms. Fluorine is highly electronegative and does not have vacant orbitals to accept electron density from carbon. Therefore, there is no possibility for back bonding or delocalization, making CF3⁻ less stable compared to CCl3⁻.

### Step 4: Conclusion on Acidity
Since CCl3⁻ is more stable than CF3⁻, it follows that CHCl3 is more acidic than CHF3. Thus, **Statement 1 is true**.

### Step 5: Evaluate Statement 2
Statement 2 claims that CCl3⁻ is stabilized through p-pi-d-pi back bonding. As established in the analysis, this type of bonding does occur due to the presence of vacant d orbitals in chlorine, which allows for the stabilization of CCl3⁻. Therefore, **Statement 2 is also true**.

### Step 6: Determine the Relationship Between the Statements
Since both statements are true and Statement 2 correctly explains why Statement 1 is true, the correct answer is that both statements are true, and Statement 2 is a correct explanation for Statement 1.

### Final Answer
**Option A**: Statement 1 is true. Statement 2 is true. Statement 2 is a correct explanation for Statement 1.

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