Question

A carboxylic acid C2H4O2 reacts with an alcohol in the presence of H2SO4 to form a compound X .The alcohol on oxidation with alkaline KMnO4 followed by acidification gives the sane carboxylic acid, C2 H4O2. Write the name structure of

(a)Carboxylic acid, (b) alcohol (c) the compound X

Answer 1

a) Carboxylic acid is ethanoic acid CH₃COOH. Commonly known as acetic acid.
b) Alcohol is ethanol CH₃CH₂OH.
c) Compound X is ester of ethanoic acid and ethanol that is ethyl acetate. CH₃COOCH₂CH₃

Reactions:
1) Formation of X from carboxylic acid and alcohol.
CH₃CH₂OH + CH₃COOH $\to$ CH₃COOCH₂CH₃ + H₂O

2) Oxidation of alcohol with alkaline KMnO4 followed by acidification to form same carboxylic acid.
5 CH₃CH₂OH(aq) + 4 KMnO₄(aq) + 6 H₂SO₄(aq) $\to$ 5CH₃COOH(aq) + 4 MnSO₄(aq) + 2 K₂SO₄(aq) + 11 H₂O(l)
For your grade senstivity reaction can be written as follows:
CH₃CH₂OH(aq) $\underset{acidification}{\overset{alk.KMn{O}_4}{\to }}$ CH₃COOH(aq)