Select all that apply. When the products of a reaction have less energy than the reactants:
A. The reaction is endothermic.
B. The change in enthalpy is positive.
C. The reaction is exothermic.
D. The reactants lost internal energy.

The problem here is that according to aufbau principle before 3d orbital 4s subshell comes.after filling 3p orbital with electrons you have 4 electrons left, you place two in 4s with opposite spin and the other two in 3d in any of its two orbitals of total five orbitals with the same spin.

The correct answer is b) false