An ideal gas is compressed to half its initial volume by means of several processes. Which of the process results in the maximum work done on the gas?

The  P-V  diagram of an ideal gas compressed from its $\text{ initial volume }{V}_0\text{ to }\frac{V_0}{2}\text{ by several processes is shown in }$the figure.

$\text{ Work done on the gas }=\text{ Area under }P-V\text{ curve }$

As area under the P-V curve is maximum for adiabatic process, so work done on the gas is maximum for adiabatic
process.