If a reaction is exothermic and there is a great disorder, it means that

An exothermic reaction is one that releases heat, resulting in a decrease in the system's enthalpy (\(ΔH 0\). In order to determine the effect on free energy, we can use the Gibbs free energy equation:

\(ΔG = ΔH - TΔS\)

Since the reaction is exothermic, \(ΔH\) is negative. The reaction also has a great disorder, making \(ΔS\) positive. The temperature, \(T\), is always positive (measured in Kelvin). Therefore, the term \(TΔS\) will be positive.

Subtracting a positive value from a negative value (\(ΔH - TΔS\) will result in a more negative value. This means that the change in Gibbs free energy, \(ΔG\), is negative, indicating a large decrease in free energy. So, the correct answer should be Option D: there will be a large decrease in free energy.