Question

7. A haloalkane A if heated with Na- metal in presence of dry ether produces 2,3 –dimethyl butane.

I. Identify A and write the chemical reactions.

II. Write the name of reaction.

III. What happens when A is treated with Zn/HCl. Show by reaction.

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Answer 1

Explanation:

(a) Wurtz reaction

Alkyl halides react with sodium in presence of dry ether to form higher alkanes. For example, methyl bromide reacts with sodium in presence of dry ether to form ethane.

CH

3

−Br+2Na+Br−CH

3

dry ether

CH

3

−CH

3

+2NaBr

(b) Wurtz-Fittig reaction

Aryl halides react with alkyl halides in presence of sodium to form substituted aromatic compounds. For example, bromobenzene reacts with methyl iodide in presence of sodium to form toluene.

C

6

H

5

−Br+2Na+I−CH

3

→C

6

H

5

−CH

3

+NaBr+NaI

Answer 2

Answer:

a) Wurtz reaction

Alkyl halides react with sodium in presence of dry ether to form higher alkanes. For example, methyl bromide reacts with sodium in presence of dry ether to form ethane.

CH

3

−Br+2Na+Br−CH

3

dry ether

CH

3

−CH

3

+2NaBr

(b) Wurtz-Fittig reaction

Aryl halides react with alkyl halides in presence of sodium to form substituted aromatic compounds. For example, bromobenzene reacts with methyl iodide in presence of sodium to form toluene.

C

6

H

5

−Br+2Na+I−CH

3

→C

6

H

5

−CH

3

+NaBr+NaI

Explanation:

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