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Shristi heated Ethanol with a compound A in presence of a few drops of concentrated sulphuric acid and observed a sweet smelling compound B is formed.
When B is treated with sodium hydroxide it gives back Ethanol and a compound C.
- Identify A and C
- Give one use each of compounds A and B.
- Write the chemical reactions involved and name the reactions.
Answer:
(a)
- The sweet smelling compound is ester obtained on reaction of Carboxyllic acids (except methanoic acid) with conc. H2SO4 .
- Therefore,
A - Ethanoic acid / Or any other carboxylic acid
B - Ester
C - Sodium salt of ethanoic acid/ any other carboxylic acid/ sodium ethanoate
(b) A- used as dil solution used as vinegar in cooking/ preservative in pickles
B – used in making perfumes, as flavoring agent
(c)
Esterification Reaction:
CH 3 COOH + C 2 H 5 OH------------> CH 3 COOC 2 H 5 +H 2 O
Saponification Reaction:
CH 3 COOC 2 H 5 + NaOH----------> CH 3 COONa + C 2 H 5 OH
