SATHEE: Haloalkanes and Haloarenes

Haloalkanes and Haloarenes - Result Question 2

####2. Which of the following alkane cannot be made in good yield by Wurtz reaction?

[2020]

(a) 2,3-Dimethylbutane

(b) n-Heptane

(d) n-Hexane

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Solution:

(b) Wurtz reaction is used to prepare symmetrical alkanes like $R_{1} - R_{1}$ , as

$R_{1} - X + 2 N a + X - R_{1} \overset{Dry ether}{\to} R_{1} - R_{1} + 2 N a X$

If $R_{1}$ and $R_{2}$ are different, then mixture of alkanes may be obtained as

$\begin{aligned} R_{1} - X + 2 N a + R_{2} - X \overset{Dry ether}{\to} \\ R_{1} - R_{1} + R_{1} - R_{2} + R_{2} - R_{2} + 2 N a X \end{aligned}$

Hence, $n$ -heptane cannot be made in good yield using Wurtz reaction, since it is unsymmetrical alkene.

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Haloalkanes and Haloarenes - Result Question 2

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