A root tells us the longest unbranched hydrocarbon chain or ring (e.g 1=meth, 2=eth, 3=prop). The syllable after the root tells us whether there are any double bonds. ane means no double bond (ethane) .ene means there is a double bond (ethene). -yne means there is a triple bond (propyne).
Prefixes and suffixes describe the changes that have been made to the root. Prefixes are added at the beginning of the root (e.g chloroethane) Side chains are shown as a prefix, these are often called alkyl groups. Suffixes are added at the end of the root (e.g ethanol)
Reactive groups of atoms attached to a hydrocarbon chain are called functional groups. They are named by using a suffix or prefix. Some functional groups have a prefix and a suffix. E.g alcohol has the suffix -ol and the prefix hydroxy. The suffix is only used if it is the only functional group.
Compounds are named alphabetically, so bromo is written before iodo. In chemical names, numbers are separated by commas and a hyphen is placed between words and numbers
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