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If I draw structure of 2-bromo-4-chloropentane and 4-chloro-2-bromopentane I get same result, when I try to draw structure. So why is it necessary to name prefixes alphabetically. Can we write iupac name not alphabetically.

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  • $\begingroup$ I think it's just a discipline.. nothing much. $\endgroup$ – Priyanshu Das Oct 12 '19 at 3:52
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With the preferred IUPAC name (PIN), there is exactly one way that you expect to find a compound written.

Assume you want to buy the compound from the chemical supplier of your choice but don’t have a CAS number at hand. What do you do? You search for the compound in the catalogue. In the old days, these were always paper books that you could use as a weapon but nowadays electronic catalogues exist to. Still, if you’re looking for 1-bromo-3-chloropentane but it is entered into the catalogue as 3-chloro-1-bromopentane, you’re going to have a very hard time searching for it.

There are also other reasons why having one defined standard way of naming compounds is strongly preferred over random but clear.

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