Primary carbon
| Primary Carbon |
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| Structural formula of propane (C3H8; primary carbons are highlighted red) |
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In organic chemistry, a primary carbon is a carbon atom which is bound to only one other carbon atom. It is thus at the end of a carbon chain. In case of an alkane, three hydrogen atoms are bound to a primary carbon (see propane in the figure on the right). A hydrogen atom could also be replaced by a hydroxy group (−OH), which would make the molecule a primary alcohol.
| primary carbon | secondary carbon | tertiary carbon | quaternary carbon | |
| General structure (R = Organyl group) |
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| Partial Structural formula |
