According to the carbon skeleton in the molecule

The bond between carbon atoms in a molecule

Compounds that are similar in structure but differ in composition by CH2 or multiples thereof form a series

individual compounds in the series

The molecular formula is the same, but the atoms are connected in a different order

A, B, C, D, etc. represent the number of carbon atoms below ten

Eleven, twelve, etc. indicate ten or more

Select the main chain (the longest carbon chain)

Label number (starting from the end closest to the branch chain)

Small branch chains are placed in the front, and "better" groups are placed in the back.

"Minimum series" assured room

There is a comma between "A" and "A"

Short connection between "Ah" and "Han"

Straight

Branched

Alkanes have only two bonds, C—C and C—H.

The electronegativities of carbon and hydrogen are very different

Oxidation

combustion

each specific conformation