ethanol to but-2-ene-1-oic acid
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Explanation: This is a three steps reaction.
1) Ethanol reacts with thionyl chloride in presence of pyridine to give chloroethane.
C₂H₅OH + SOCl₂ → C₂H₅Cl + SO₂ + HCl
2) Chloroethane reacts with Na metal in presence of dry ether to give butane. This is a Wurtz reaction.
2C₂H₅Cl + Na → CH₃CH₂CH₂CH₃
3) Butane reacts with alcoholic KMnO₄ to give butanoic acid.
CH₃CH₂CH₂CH₃ + Alc. KMnO₄ → CH₃CH₂CH₂COOH
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