For an ideal gas with initial pressure and volume $p_i$ and $V_i$ respectively, a reversible isothermal expansion happens, when its volume becomes $V_0$. Then, it is compressed to its original volume $V_i$ by a reversible adiabatic process. If the final pressure is $p_f$ then which of the following statement(s) is/are true?

The initial pressure and volume of a given mass of an ideal gas with $\left(\frac{C_p}{C_V}=\gamma \right)$, taken in a cylinder fitted with a piston, are $p_0$ and $V_0$ respectively. At this stage the gas has the same temperature as that of the surrounding medium which is $T_0.$ It is adiabatically compressed to a volume equal to $\frac{V_0}{2}.$
Subsequently the gas is allowed to come to thermal equilibrium with the surroundings. What is the heat released to the surrounding?