Meth eth prop but language

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If there are multiple functional groups on the same parent chain, multiplying prefixes are used: bonded to merh carbonyl group of substituents are numbered around.

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meth eth prop but pent hex hept oct non dec
From one to ten, those prefixes are meth-, eth-, prop-, but-, pent-, hex-, hept-, oct-, non-, dec-. The first 4 are from common usage prior to any systemic. Root names � C1 = meth- � C2 = eth- � C3 = prop- � C4 = but- � C5 = pent- � C6 = hex- � C7 = hept- � C8 = oct-. From Wikipedia's article on number prefixes: The IUPAC nomenclature of organic chemistry uses the numerical prefixes derived from Greek, except for the prefix for 9 (as mentioned) and the prefixes from 1 to 4 (meth-, eth-, prop-, and but-), which are not derived from words for numbers.