A) butane
B) ethane
C) propane
D) a mixture of the above three
Correct Answer: D
Solution :
Key Idea When alkyl halides react with sodium in the presence of anhydrous ether then alkanes are formed. This reaction is called Wurtzs reaction. \[C{{H}_{3}}Br+2Na+BrC{{H}_{3}}\xrightarrow{Ether}C{{H}_{3}}\,.\,\,C{{H}_{3}}\] + 2NaBr When methyl iodide and ethyl iodide react with sodium in ethereal solution, a mixture of propane, ethane, and butane is obtained as follows \[C{{H}_{3}}C{{H}_{2}}C{{H}_{3}}\xrightarrow{Ether}\]\[\underset{propane}{\mathop{C{{H}_{3}}\,.\,C{{H}_{2}}C{{H}_{3}}}}\,\] \[C{{H}_{3}}C{{H}_{3}}\xrightarrow{Ether}\]\[\underset{ethane}{\mathop{C{{H}_{3}}\,.\,C{{H}_{3}}}}\,+2NaI\] \[C{{H}_{3}}{{C}_{2}}{{H}_{5}}\xrightarrow{Ether}\underset{bu\tan e}{\mathop{{{C}_{2}}{{H}_{5}}\,.\,{{C}_{2}}{{H}_{5}}}}\,\] + 2 Nal Note - Methane cannot be prepared by this method.
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