Decide the mechanism by which the following alkyl halides will be converted to alcohols by the substitution of the nucleophile, oh-.
r-x + oh- > r-oh + x-
3-bromo-2-methylpentane
1-chloro-2,2-dimethylpropane
1-bromo-1-methylcyclohexane
1-bromo-2-methylcyclohexane

I'm not sure but i will try to find out

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.