\( 80 \, \text{mL} \) of a hydrocarbon on mixing with \( 264 \, \text{mL} \) of oxygen in a closed U-tube undergoes complete combustion. The residual gases after cooling to \( 273 \, \text{K} \) occupy \( 224 \, \text{mL} \). When the system is treated with KOH solution, the volume decreases to \( 64 \, \text{mL} \). The formula of the hydrocarbon is:
