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Hydrocarbons — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryHydrocarbons1 Mark
MCQ
Which of the following alkanes can be synthesized by the Wurtz reaction in good yield?
  • A
    $ \left(\mathrm{CH}_3\right)_2 \mathrm{CH}-\mathrm{CH}_2-\mathrm{CH}\left(\mathrm{CH}_3\right)_2 $
  • ✓
    $ \left(\mathrm{CH}_3\right)_2 \mathrm{CH}-\mathrm{CH}_2-\mathrm{CH}_2-\mathrm{CH}\left(\mathrm{CH}_3\right)_2 $
  • C
    $ \mathrm{CH}_3-\mathrm{CH}_2-\mathrm{C}\left(\mathrm{CH}_3\right)_2 \mathrm{CH}_2-\mathrm{CH}_3 $
    ​​
  • D
    $ \left(\mathrm{CH}_3\right)_3 \mathrm{C}-\mathrm{CH}_2-\mathrm{CH}_2-\mathrm{CH}_3 $
✓

Answer

Correct option: B.
$ \left(\mathrm{CH}_3\right)_2 \mathrm{CH}-\mathrm{CH}_2-\mathrm{CH}_2-\mathrm{CH}\left(\mathrm{CH}_3\right)_2 $
An even number of symmetrical alkyl halides can easily undergo Wurtz reaction as these form symmetrical alkanes which have uniform physical or chemical properties.
A general form of Wurtz reaction is
$\ce{2RX + 2Na \rightarrow R−R + 2NaX}$
Here, $R$ denotes any alkyl group, and $X$ is a halogen atom.
Asymmetric alkanes are not favorable to prepare by Wurtz reaction as the mixture of different products formed which are very difficult to seperate.
In the given options, $B$ is a symmetric alkane that can be easily prepared by the Wurtz reaction.

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