Department of Energy and Argonne National Lab researchers have recently found that termolecular [ter-mo-lecular] reactions may play a significant role in a number of processes. Why had chemists previously considered termolecular reactions to be insignificant?

W) Termolecular reactions have high changes in entropy

X) Termolecular reactions are usually endothermic

Y) Termolecular reactions are forbidden by the Woodward-Hoffmann rules

Z) Termolecular reactions are statistically unlikely to occur
Z) TERMOELULAR REACTIONS ARE STATISTICALLY UNLIKELY TO OCCUR