Assign priorities to the following sets of sub stituents:

(a) – H, – OH, – CH₂CH₃, – CH₂CH₂OH

(b) – CO₂H, – CO₂CH₃, – CH₂OH, – OH

(c) – CN, – CH₂NH₂, – CH₂NHCH₃, – NH₂

(d) – SH, – CH₂SCH₃, – CH₃, —SSCH₃