To arrange alkenes in order of stability, we need to know that the most substituted the double bond is, the more stable the alkene is. Alkenes can be divided into four categories: monosubstituted (double bond is directly attached to one carbon), disubstituted (double bond is attached to two carbons), trisubstituted (double bond is attached to three carbons), and tetrasubstituted (double bond is attached to four carbons).
Monosubstituted alkenes are least stable and tetrasubstitued alkenes are most stable. It is also important to note that to figure out substitution we focus on carbons directly attached to the double bond. However, many more carbons and functional groups can exist in the molecule without affecting the substitution.
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