Q. 39 A4.4( 5 Votes )

Write the rules used in nomenclature of alkane.

Answer :

The rules used in nomenclature of alkanes are:

Select the longest straight chain of carbon atoms in the molecular structure - this gives the parent name of the compound.


● Recognize any substituent on the longest chain. There are usually the following alkyl substituents:



Number the carbon atoms on the straight chain, such that those bearing the substituent would have the lowest number.


● If there are two or more same substituent, use the prefixes: di- for two; tri-for three and tetra- for four, before the name of the substituent.


● If there are two substituents on the same carbon, then the position of that carbon is indicated twice before the names of the substituents.


● Write the names of the compound as one word, separate numbers from substituents groups and prefixes with a hyphen and numbers from each other with a comma .


● The position of carbon bearing the substituents is written first, followed by prefixes, then the name of substituents in alphabetical order, then finally the parent name.


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