The IUPAC system is designed so that a compound’s name and structure determine each other unambiguously. The name encodes three things:

1. The length of the parent chain (how many carbons)
2. The principal functional group (what kind of compound it is)
3. The location and identity of all substituents (what is attached, and where)

Given a name, a trained chemist can reconstruct the structure. Given a structure, a trained chemist can derive the name. The goal for students is to move comfortably in both directions for the compound classes covered in Organic Chemistry I and II.

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