Which of the following reactions can be used to prepare methane?

Decarboxylation of sodium acetate

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Kolbe's electrolysis of sodium acetate

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Wurtz reaction

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Hydrogenation of alkenes

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Solution

The correct option is A Decarboxylation of sodium acetate
A) Decarboxylation of sodium acetate $({C H}_{3} C O O N a)$ gives methane.

${C H}_{3} C O O N a + N a O H C a O / Δ ⟶ {C H}_{4} + {N a}_{2} {C O}_{3}$

B) Kolbe electrolysis of ${C H}_{3} C O O N a$ will give ethane not methane.

${2 C H}_{3} C O O N a + 2 H_{2} O e l e c t r o l y s i s ⟶ {C H}_{3} - {C H}_{3} + 2 {C O}_{2} + H_{2} + 2 N a O H$

C) Wurtz reaction will give more than one carbon-containing alkane. So methane can't be prepared by the Wurtz reaction.

D) Hydrogenation of alkenes gives also more than one carbon-containing alkane, not methane.
Hence, option A is correct.

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