Question

Starting from iodomethane, how would
you prepare:
i. Ethane
ii. Ethene

Answer 1

Answer:Preparation of Ethane

When iodomethane or methyl iodide is treated with sodium metal in the presence of ether as solvent, ethane is formed.

2CH3I + 2Na ————→ C2H6 (ethane) + 2NaI

In this reaction other products are also formed.

Preparation of Ethene

From what I know, you cannot prepare ethene from iodomethane (methyl iodide) but from ethyl iodide.

When ethyl iodide or iodoethane is treated with alcoholic potassium hydroxide, it produces ethene.

CH3-CH2-I + KOH —————-> CH2=CH2 + KI + H2O

Explanation:

Answer 2

Answer:

Ethane preparation

• Ethane is produced when sodium metal is used to treat iodomethane or methyl iodide in the presence of ether as a solvent.

• C2H6 (ethane) + 2NaI ⇒ 2CH3I + 2Na

• Other products are also produced in this reaction.

Making of Ethene

• Iodomethane (methyl iodide), as far as I'm aware, cannot be used to make ethene; only ethyl iodide can.

• Alcoholic potassium hydroxide is used to treat ethyl iodide or iodoethane to create ethene.

• KOH + CH3-CH2-I ⇒ KI + H2O + CH2 = CH2.

• The United States Environmental Protection Agency had certified iodomethane for use as a pesticide in 2007 as a pre-plant biocide used to combat insects, plant parasitic nematodes, soil borne diseases, and weed seeds.

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