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Question:

The IUPAC name of the following compound is: 3,5-dimethyl-4-propylhept-6-en-1-yne

3-methyl- 1-4-(1-methylprop-1yny1)-1-heptyne

3,5-dimethyl-4-propyhept-6-en-1-yne

3-methyl- 1-4-(3-methylprop-1eny1)-1-heptyne

3-5-Dimethyl-4-propylhept-1-en-6-yne

Solution:

3,5-Dimethyl-4-propylhept-1-en-6-yne. Longest carbon chain, including multiple bonds, and numbering starts from the double bond.