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Hydrocarbons

Section: Chemistry

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Question : 6 of 23

Marks: +1, -0

When ethyl bromide and n-propyl bromide are allowed to react with Na metal in dry ether, the number of different alkanes formed is

[AP EAPCET 21 May 2025 S1]

1
2
3
4

Solution:

The reaction is a Wurtz reaction, In the given case, three alkanes are formed

2\mathrm{C}_2\mathrm{H}_5\mathrm{Br}+2\mathrm{Na}\xrightarrow[\;\text{ Ether }\;]{\;\text{ Dry }\;}\;\underset{\;\text{ Butane }\;}{\mathrm{C}_4\mathrm{H}_{10}}+2\mathrm{NaBr}

2\mathrm{C}_3\mathrm{H}_7\mathrm{Br}+2\mathrm{Na}\xrightarrow[\;\text{ Ether }\;]{\;\text{ Dry }\;}\;\underset{\;\text{ Hexane }\;}{\mathrm{C}_6\mathrm{H}_{14}}+2\mathrm{NaBr}

\mathrm{C}_2\mathrm{H}_5\mathrm{Br}+\mathrm{C}_3\mathrm{H}_7\mathrm{Br}+2\mathrm{Na}\rightarrow\;\underset{\;\text{ Pentene }\;}{\mathrm{C}_5\mathrm{H}_{12}}+2\mathrm{NaBr}

\therefore

Butane, hexane, pentane are formed.

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