Alcohol forms a homologous series with general formula CnH2n+1–OH and –OH group as functional group. Ethanol…
Alcohol forms a homologous series with general formula CnH2n+1–OH and –OH group as functional group. Ethanol is commonly called alcohol and is used in alcoholic drinks. It is good solvent, used in medicines, cough syrups, tonics etc. [1+1+2]
(a) Write structural formula and name of 4th member of alcohol homologous series.
(b) What happens when ethanol is heated with alkaline KMnO4 ? Write chemical equation involved.
(c) Write the chemical equation of reaction of ethanol with ethanoic acid in the presence of concentrated H2SO4. Write the name of this reaction.
Solution
(a)
• CH3 − CH2 − CΗ2 − CΗ2 − ΟΗ /
• Butanol
(b)
• Ethanol gets oxidised to form ethanoic acid.
alkaline KMnO4 +heat
• CH3 − CH2 − ΟΗ → CH3 COOH
(c)
PAGE6 (SET 31/5/1)
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• Esterification reaction.
OR
(c)
• Ethanol will get dehydrated to form ethene.
Conc.H2 SO4 at 443K
• C2 H5 OH → CH2 = CH2 + H2 O
• Dehydrating agent/ Catalyst