An organic compound 'A' is widely used as a preservative in pickles and has the molecular formula C2H4O2. this compound reacts with ethanol to form a sweet-smelling compound 'B'.
(i) Identify the compound 'A'.
(ii) write the chemical equation for its reaction with ethanol to form compound 'B'.
(iii) How can we get compound 'A' from 'B'? Name the process and write the corresponding chemical equation.
(iv) Which gas is produced when compound 'A' reacts with washing soda? Writhe the chemical equation.
Answers
(2)- CH3COOH+ C2H5OH ------->CH3COOC2H5+ H2O
(3)- SAPONIFICATION
(4)- CO2 gas IS PRODUCED...
(a) Compound A with molecular formula C2H4O2 is ethanoic acid, also called acetic acid. Its structural formula is CH3COOH. A dilute solution of acetic acid called vinegar is used as a preservative of pickles.
(b) Compound A reacts with ethanol to form compound B which is an ester and has a pleasant smell. The reaction is called esterification reaction.
CH3COOH + C2H5OH -----> CH3 COOC2H5 + H2O
Ethanoic acid Ethyl ethanoate
(c) Compound A can be obtained from ethyl ethanoate by reacting with water in the presence of dilute hydrochloric acid acting as a catalyst.
CH3COOC2H5 + H2O -------> CH3COOH + C2H5OH
Ethyl ethanoate Ethanoic acid
(d) Process is ester hydrolysis.
(e) Carbon dioxide is evolved with effervescence when compound A reacts with washing soda.