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What is the best name for the molecule below?

4-ethyl-6-heptene
4-propyl-1-hexene
2-methyl-3-heptyne
3-propyl-5-hexene

What is the best name for the molecule below 4ethyl6heptene 4propyl1hexene 2methyl3heptyne 3propyl5hexene class=

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Greenleafable
You start numbering from the side with the methyl group and find the longest chain, which is seven = hept. The triple bond is -yne at C3. The methyl group is on C2.
This means that the best name for this molecule is 2-methyl-3-heptyne.

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