Identify the functional group(s) present in organic compound Q (C4H8O2) based on the provided reaction tests.

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Q5: Organic Compound Q ($\text{C}_4\text{H}_8\text{O}_2$)

a) The first functional group was tested as follows:
I. Compound Q reacted with sodium to give hydrogen gas and $\text{C}_4\text{H}_7\text{O}_2\text{Na}$. This indicates the presence of an acidic hydrogen, characteristic of an alcohol or carboxylic acid.
II. Compound Q was heated with ethanoic acid ($\text{CH}_3\text{COOH}$) in the presence of concentrated sulphuric acid to form $\text{C}_6\text{H}_{10}\text{O}_3$ (sweet smell). This is