Which of the following alkanes cannot be prepared in good yield by Wurtz reaction?

2,3-Dimethylbutane

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Propane

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n-Butane

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Ethane

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Solution

The correct option is B Propane
Wurtz reaction is used to prepare symmetrical alkanes in good yield.
$R_{1} - X + 2 N a + X - R_{1} Dry ether - ---- \to R_{1} - R_{1} + 2 N a X$
If $R_{1}$ and $R_{2}$ are different, then mixture of alkanes may be obtained as:
$R_{1} - X + N a + X - R_{2} Dry ether - ---- \to R_{1} - R_{1} + R_{1} - R_{2} + R_{2} - R_{2}$

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