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Hydrocarbons
Preparation of Alkanes – Wurtz Reaction
1 question from 1 paper, each with its answer.
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- years asked, 2017–2026
- 1 of 10
- of Hydrocarbons
- 1.33%
Concepts tested
- alkanes obtainable by Wurtz reaction
All Questions
2020 1 question
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Which of the following alkane cannot be made in good yield by Wurtz reaction?The Wurtz reaction is used to prepare symmetrical alkanes: $R-X + 2Na + X-R \xrightarrow{dry\ ether} R-R + 2NaX$ If $R_1$ and $R_2$ are different, a mixture of alkanes ($R_1-R_1$, $R_1-R_2$, $R_2-R_2$) is obtained. n-Heptane (odd number of carbons, $C_3 + C_4$) is unsymmetrical, so it cannot be made in good yield. 2,3-Dimethylbutane, n-butane and n-hexane are symmetrical.