The elementary reaction of two moles of nitrogen dioxide reacting with one mole of fluorine gas to produce 2 moles of NL2F gas is an example of a blank type of reaction. All right, so here we're talking about molecularity. So we need to determine the total number of reactant moles involved.
So here we have two moles of nitrogen dioxide and one mole of fluorine gas. Together that totals 3 moles of reactants. So unimolecular means we only have one mole of reactants. Bimolecular would mean two, Tetra would mean four.
So the answer is either B or D. So it's either trimolecular or termolecular. And remember from our earlier videos when it comes to molecularity, 3 moles of reactants is referred to as termolecular. Trimolecular does not exist. So here the answer would be option D.