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This question already has an answer here:

As title reads, why shouldn't 1-methyl-hexane work but 2-methyl-hexane and 3-methyl-hexane does?

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marked as duplicate by Mithoron, aventurin, airhuff, Jon Custer, Todd Minehardt Jun 3 '18 at 18:14

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You need to always number your longest chain first. If you draw 1-methylhexane, you'll see the longest chain isn't actually 6 carbons anymore, but 7. Then all the atoms are part of the longest chain, and the name simply becomes heptane.

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