How many monochloro substitution products are produced when the alkanes below are chlorinated? consider constitutional isomers only, ignore stereoisomers.

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 air is going to come out because of the low pressure.