Reagent (s) used for the conversion of propanol 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 (C3H8O) to propane (C3H8), we can follow a two-step process using specific reagents. Here’s a step-by-step breakdown of the solution:

### Step 1: Convert Propanol to Propyl Tosylate
1. **Identify the starting material**: Propanol is CH3-CH2-CH2-OH.
2. **Use TsCl (Tosyl chloride) in the presence of pyridine**:
- TsCl reacts with the hydroxyl group (-OH) of propanol to form propyl tosylate (CH3-CH2-CH2-OTS).
- Pyridine acts as a base and helps in the reaction by deprotonating the hydroxyl group, facilitating the substitution reaction.

**Reaction**:
\[ \text{CH}_3\text{-CH}_2\text{-CH}_2\text{-OH} + \text{TsCl} \xrightarrow{\text{Pyridine}} \text{CH}_3\text{-CH}_2\text{-CH}_2\text{-OTS} + \text{HCl} \]

### Step 2: Reduce Propyl Tosylate to Propane
3. **Use Lithium Aluminium Hydride (LiAlH4)**:
- Propyl tosylate can be reduced to propane by using lithium aluminium hydride, which is a strong reducing agent.
- This reduction will replace the tosylate group with hydrogen, yielding propane.

**Reaction**:
\[ \text{CH}_3\text{-CH}_2\text{-CH}_2\text{-OTS} + \text{LiAlH}_4 \rightarrow \text{CH}_3\text{-CH}_2\text{-CH}_3 + \text{by-products} \]

### Final Answer
The reagents used for the conversion of propanol to propane are **TsCl (Tosyl chloride) in the presence of pyridine, followed by LiAlH4 (Lithium Aluminium Hydride)**.

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