Reagent (s) used for the conversion of propanol into propane is

Options

A. `I_2//P`
B. (i) TsCl/Py (ii) `LiAlH_4`
C. Cone. `H_2SO_4`
D. `CH_2N_2` /ether

Answer

To convert propanol (CH3CH2CH2OH) into propane (CH3CH2CH3), we can follow these steps:

### Step 1: Identify the Reaction Type
The conversion of propanol to propane involves the removal of the hydroxyl group (-OH) from propanol, which is a dehydroxylation reaction. This can be achieved through various reagents.

**Hint:** Look for reagents that can facilitate the removal of -OH and add hydrogen.

### Step 2: Choose the Reagents
One effective method to achieve this conversion is by using iodine (I2) in the presence of phosphorus (P). When I2 reacts with phosphorus, it forms phosphorus triiodide (PI3), which can then react with the alcohol (propanol) to form an alkyl iodide (propyl iodide, CH3CH2CH2I).

**Hint:** Consider reagents that can convert alcohols into alkyl halides.

### Step 3: Reaction Mechanism
1. **Formation of PI3:** I2 + P → PI3
2. **Reaction with Propanol:**
- CH3CH2CH2OH + PI3 → CH3CH2CH2I + H3PO3 (phosphorous acid)

This step converts propanol into propyl iodide.

**Hint:** Remember that the formation of an alkyl halide is a key step in converting alcohols.

### Step 4: Reduction to Propane
Next, the propyl iodide can be reduced to propane using lithium aluminum hydride (LiAlH4). This reagent is a strong reducing agent that can convert alkyl halides to alkanes.

**Hint:** Look for reducing agents that can convert halides to alkanes.

### Step 5: Final Reaction
The reduction reaction can be summarized as:
- CH3CH2CH2I + LiAlH4 → CH3CH2CH3 + LiI + Al(OH)3

This final step yields propane from propyl iodide.

**Hint:** Always check the final product to ensure it matches the desired compound.

### Conclusion
Thus, the reagents used for the conversion of propanol into propane are:
1. I2 in the presence of phosphorus (to form propyl iodide)
2. Lithium aluminum hydride (to reduce propyl iodide to propane)

**Final Answer:** The reagents used for the conversion of propanol into propane are I2 with phosphorus and lithium aluminum hydride.