CBSE Class 10 Science 2020 · Paper 31/C/1 · Question 25(a)

A compound ‘A’ (molecular formula ${\text{C}}_3{\text{H}}_6{\text{O}}_2$) reacts with sodium metal to form compound ‘B’ and evolves a gas which burns with a pop sound. The compound ‘A’ on treatment with alcohol ‘C’, found in beer, in presence of concentrated sulphuric acid, forms a sweet smelling compound ‘D’ (molecular formula ${\text{C}}_5{\text{H}}_{10}{\text{O}}_2$). On addition of $\text{NaOH}$ to ‘A’ it also gives ‘B’ and water. ‘D’ on treatment with $\text{NaOH}$ gives back ‘B’ and ‘C’. Identify ‘A’, ‘B’, ‘C’ and ‘D’ and write down the chemical equations of the reactions involved.