Open-chain
noun, Chemistry.
1.
a series of atoms linked in a chain not joined together at its ends, and so represented in its structural formula.
noun
1.
a chain of atoms in a molecule that is not joined at its ends into the form of a ring
open chain
An arrangement of atoms of the same type that does not form a ring. Aliphatic compounds, such as ethane and isopropyl alcohol, are open-chain compounds.
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