We begin by analyzing product energy partitioning. At room temperature using the DZPE approach, the QCT/PES-2023 energy fractions as vibration, rotation and translation for both products, HCN and C2H5 are, respectively (in percentages): fv HCN = 65, fR HCN = 6, fv ethyl = 12, fR ethyl = 7 and ftrans = 10. Clearly, the largest fraction of energy is deposited as vibration energy of the HCN product, 65%, with few rotational excitations in both products. This is the expected behaviour in a very exothermic reaction with a heavy-lightheavy mass combination. The small fraction of energy deposited as vibration in the C2H5 co-product, 12%, suggests that this product will appear practically in its vibrational ground-state. This tendency is similar to that found for the CN + CH4 reaction: 52, 8, 15, 7, and 18%, respectively, (note that, strictly speaking, these values correspond to a fixed collision energy of 1.0 kcal mol -1 ) showing that these reactions with alkanes present similar dynamic behaviour.