The prefix "n-" (or normal) is used when all carbons type a continuous, unbranched (linear) chain. If a functional group (such as an alcohol) is existing that functional team is on the finish of the chain. Not to be puzzled with "nor", which indicates a lacking methyl group.
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|Common name: n-pentane IUPAC name: pentane||Common name: n-pentanol IUPAC name: 1-pentanol|
|Common name: isopentane IUPAC name: 2-methylbutane||Common name: isopentyl alcohol IUPAC name: 3-methyl-1-butanol|
|Common name: phthalic mountain IUPAC name: benzene-1,2-dicarboxylic acid||Common name: isophthalic mountain IUPAC name: benzene-1,3-dicarboxylic acid|
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|Common name: neopentane IUPAC name: 2,2-dimethylpropane||Common name: neopentyl alcohol IUPAC name: 2,2-dimethyl-1-propanol|
The prefix "sec" or "s" is used when the functional group is external inspection to a secondary carbon. This prefix is only advantageous for a four-carbon chain. That is not applicable through a shorter chain, and it is often ambiguous when the chain has 5 or an ext carbons.