For each of the following reactions, give the substitution products; if the products can exist as stereoisomers,

Question:

For each of the following reactions, give the substitution products; if the products can exist as stereoisomers, show what stereoisomers are obtained:
a. (R)-2-bromopentane + high concentration of CH3O-
b. (R)-2-bromopentane + CH3OH
c. trans-1-chloro-2-methylcyclohexane + high concentration of CH3O-
d. trans-1-chloro-2-methylcyclohexane + CH3OH
e. 3-bromo-2-methylpentane + CH3OH
f. 3-bromo-3-methylpentane + CH3OH