Write chemical reactions to illustrate the following:(i) Kolbe's react

1.	Write chemical reactions to illustrate the following:(i) Kolbe's reaction (ii) Wurtz reaction
Answer» (i) Kolbe's reaction : In this reaction, an aqueous solution of sodium or potassium salt of carborylic acid on electrolysis gives alkane having even number of carbon atoms at anode. 2CH₃COO–Na + +2H₂O → CH₃–CH₃ + 2CO₂ + H₂ + 2NaOH Ethane (ii) Wurtz reaction : In this reaction, alkyl halides on treatment with sodium in dry ether gives higher alkanes, preferably containing even number of carbon atoms. CH₃Br + 2Na + BrCH₃ \(\underset{ether}{\stackrel{dry}{\rightarrow}}\) CH₃ – CH₃ + 2 NaBr Ethane

Write chemical reactions to illustrate the following:(i) Kolbe's reaction (ii) Wurtz reaction

Answer»

(i) Kolbe's reaction : In this reaction, an aqueous solution of sodium or potassium salt of carborylic acid on electrolysis gives alkane having even number of carbon atoms at anode.

2CH₃COO–Na + +2H₂O → CH₃–CH₃ + 2CO₂ + H₂ + 2NaOH

Ethane

(ii) Wurtz reaction : In this reaction, alkyl halides on treatment with sodium in dry ether gives higher alkanes, preferably containing even number of carbon atoms.

CH₃Br + 2Na + BrCH₃ \(\underset{ether}{\stackrel{dry}{\rightarrow}}\)

CH₃ – CH₃ + 2 NaBr Ethane

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