Assertion: In order to convert R-Cl to pure `R-NH_(2)`, Gabriel pthalimide synthesis can be used.
Reasaon: With proper choice of alkyl halides. Pthalimide synthesis can be used to prepare `1^(@),2^(@)` or `3^(@)` amines.

Options

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

Explanation

To solve the question, we will analyze both the assertion and the reason provided.

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that Gabriel phthalimide synthesis can be used to convert R-Cl to pure R-NH2.
- Gabriel phthalimide synthesis is a well-known method for synthesizing primary amines from alkyl halides.

2. **Understanding the Reason**:
- The reason claims that with the proper choice of alkyl halides, phthalimide synthesis can prepare 1°, 2°, or 3° amines.
- However, this statement is misleading because Gabriel phthalimide synthesis primarily yields primary amines (1° amines) and is not suitable for preparing secondary (2°) or tertiary (3°) amines.

3. **Analyzing the Mechanism**:
- In Gabriel phthalimide synthesis, phthalimide reacts with a strong base to form a nucleophilic phthalimide anion.
- This anion then undergoes an SN2 reaction with a primary alkyl halide (R-X) to form a N-alkyl phthalimide.
- Hydrolysis of this intermediate leads to the formation of the primary amine (R-NH2) and phthalic acid.

4. **Conclusion**:
- The assertion is true because Gabriel phthalimide synthesis can indeed convert R-Cl to R-NH2.
- The reason is false because Gabriel phthalimide synthesis cannot produce secondary or tertiary amines; it is limited to primary amines.

### Final Answer:
- **Assertion**: True
- **Reason**: False