Question

An organic compound ‘X’ is widely used as a preservative in pickles and has a molecular formula

C2H2O2. This compound reacts with ethanol to form a sweet smelling compound ‘Y’.

Identify X and Y.

Answer 1

 The compound ‘X‘ with molecular formula C2H4O2 is ethanoic acid also called acetic acid.

The compound ‘Y‘ =Ethyl ethanoate ( CH3COO C2H5 )



answer to ur 2nd question:


(ii) Compound X reacts with ethanol to form compound ‗Y‘ which is an ester and has pleasant smell. The reaction is called esterification reaction . 

CH3COOH                         +        C2H5OH ---------  CH3COO C2H5 + H2O acid                                                           
 
(iii) The compound ‗X‘ can be obtained from ethyl ethanoate by reacting with water in presence of dilute hydrochloric acid acting as catalyst. 

CH3COO C2H5 + H2O ----- dil.Hcl-------CH3COOH + C2H5OH 
 
(iv) This process is known is ester hydrolysis (v) Carbon dioxide gas is evolved with effervescence when the compound A reacts with washing soda which is chemically  Na2CO3. 
2CH3COOH + Na2CO3 -----------------2 CH3COONa + H2O + CO2  The gas can be identified by passing through lime water which turns milky. 
 

Answer 2

#1. X compound A ethanoic acid which is commonly known as acetic acid(CH3COOH)

#2 Y is ethyl ethanoate or ethyl acetate and
( CH3COONa )

#hope its help you