Question

An organic compound A is widely used as a preservative in pickles and has amolecular formula C2H4O2. This compound reacts with ethanol to form a sweetsmelling compound B.(a) Identify the compound A.(b) Write the chemical equation for its reaction with ethanol to form compoundB.(c) How can we get compound A back from B.(d) Name the process and write the corresponding chemical equation.(e) Which gas is produced when compound A reacts with washing soda? Writethe chemical equation?

Answer 1

a) The compund A is acetic acid CH₃COOH, it is commonly known as vinegar used in foods as a preservative.
b) Compund B is formed as follows,

CH₃COOH + C₂H₅OH ------> CH₃COOC₂H₅ + H₂Othe sweet smelling compound is an ester called ethyl acetate

c) & d) CH₃COOC₂H₅ + H₂O ---------> CH₃COOH + C₂H₅OH this reaction is called hydrolysis which occurs in presence of an acid.

e & f ) 2CH₃COOH + Na₂CO₃ --------> 2CH₃COONa + H₂O + CO₂ Carbon dioxide gas is released in the reaction.