List the following compounds in order of least oxidized to most oxidized

Question

Quizplus · Accepted Answer

In order to determine the oxidization state, we look at the number of bonds formed between the element and a more electronegative element. 
a) C-C and C-H bonds only, least oxidized
b) C-C and C-H bonds, one C-Br bond (more electronegative Br), slightly more oxidized than a)
c) C-C bonds, one C-O bond (more electronegative O), even more oxidized than b)
d) C-C bonds, one C-O bond, one C-Cl bond (more electronegative Cl), most oxidized. 
Therefore, the correct order is b < a < d < c.

List the Following Compounds in Order of Least Oxidized to Most