Sn1, Sn2, E1, E2 bases and nucleophiles

at methyl halide, what is the only reaction that can occur

Sn2

at a primary alkyl halide, an E2 elimination will occur if

a strong, sterically hindered base in used

at a primary alkyl halide, an Sn2 substitution will occur if

a good nucleophile is used

at a secondary alkyl halide, an E2 elimination will occur if

a strong base is used

at a secondary alkyl halide, an Sn2 reaction will occur if

a good nucleophile that is a weak base is used in a polar aprotic solvent

at a secondary alkyl halide, an Sn1 reaction and E1 reaction will occur at the same time if

a poor nucleophile that is a weak base is used in a protic solvent

at a tertiary alkyl halide, an E2 elimination will occur if

a strong base is used

at a tertiary alkyl halide, an Sn1 reaction along with an E1 reaction will occur if

a poor nucleophile that is a weak base is used in a protic solvent

examples of good nucleophiles that are weak bases

I-, Br-, SCN-, NH3-, CH3CO2-, RS-, CN-, amines

examples of good nucleophiles that are strong bases

HO-, RO-

poor nucleophiles which are weak bases

H2O, ROH, RSH