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while naming a compound where do we write iso??

"Iso" is the prefix to denote isomers of a compound i.e same molecular formula but different structure.

 Butane 

http://upload.wikimedia.org/wikipedia/commons/thumb/a/ab/Butane_simple.svg/200px-Butane_simple.svg.png

Iso butane

http://upload.wikimedia.org/wikipedia/commons/e/ea/Isobutane4.png

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If there are two or more different substituents they are listed in alphabatical order using the base name ( ignoring the prefixes). The only prefix which is usedwhenputting the substituents in alphabatiical order is "iso" as in isobutyl and isopropyl.

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