Which of the following alkane is synthesised from single alkyl halide by wurtz reaction:-

Options

A.
B.
C.
D.

Answer

To solve the question of which alkane is synthesized from a single alkyl halide by the Wurtz reaction, we can follow these steps:

### Step 1: Understand the Wurtz Reaction
The Wurtz reaction involves the coupling of two moles of an alkyl halide in the presence of sodium metal (Na) and dry ether to form an alkane and sodium halide (NaX). The general reaction can be represented as:
\[ 2 \text{R-X} + 2 \text{Na} \rightarrow \text{R-R} + 2 \text{NaX} \]
where R is the alkyl group and X is the halogen (Cl, Br, I).

### Step 2: Identify the Characteristics of the Alkane Formed
When two moles of the same alkyl halide react, the resulting alkane will have an even number of carbon atoms. Additionally, the alkyl halide must be symmetrical to ensure that the resulting alkane is also symmetrical.

### Step 3: Analyze the Given Options
We need to analyze the options provided to determine which alkane can be formed from a single alkyl halide using the Wurtz reaction.

1. **Option 1**: An alkane with an odd number of carbons (e.g., C5) cannot be formed from a symmetrical alkyl halide.
2. **Option 2**: An alkane with an even number of carbons but not symmetrical (e.g., C4) cannot be formed from a single alkyl halide.
3. **Option 3**: An alkane with an even number of carbons and symmetrical (e.g., C6) can be formed from a symmetrical alkyl halide.
4. **Option 4**: Similar to option 1, an alkane with an odd number of carbons cannot be formed from a symmetrical alkyl halide.

### Step 4: Conclusion
From the analysis, the only alkane that can be synthesized from a single alkyl halide by the Wurtz reaction is the one that is symmetrical and has an even number of carbon atoms. Therefore, the correct answer is **Option 3**.

### Summary of the Solution
- The Wurtz reaction couples two moles of alkyl halide to form an alkane.
- The resulting alkane must have an even number of carbon atoms and be symmetrical.
- The only option that meets these criteria is **Option 3**.