Hydrocarbons

The product formed when a hydrocarbon \(X\) of molecular formula \(\mathrm{C}_6 \mathrm{H}_{10}\) is reacted with sodamide is subjected to ozonolysis, followed by hydrolysis with \(\mathrm{Zn} / \mathrm{H}_2 \mathrm{O}_2\) and upon further oxidation gave two carboxylic acids, of which one is optically active. The hydrocarbon '\(X\)' is