What are the various possible structural formulae of a compound having molecular formula ${\mathrm{C}}_3{\mathrm{H}}_6\mathrm{O}$?

An organic compound with molecular formula ${\mathrm{C}}_2{\mathrm{H}}_4{\mathrm{O}}_2$ produces brisk effervescence on the addition of sodium carbonate / bicarbonate.

Answer the following:

Identify the organic compound.

An organic compound with molecular formula ${\mathrm{C}}_2{\mathrm{H}}_4{\mathrm{O}}_2$ produces brisk effervescence on addition of sodium carbonate / bicarbonate.

Answer the following:

Write the chemical equation for the above reaction.