The IUPAC name for the following compound is : 
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- 3, 5-dimethyl-4-propylhept-1-en-6-yne
- 3-methyl-4-(3-methylprop-1-enyl)-1-heptyne
- 3-methyl-4-(1-methylprop-2-enyl)-1-heptene
- 3,5-dimethyl-4-propylhept-6-en-1-yne
The Correct Option is A
Solution and Explanation
The principal chain must include both the C=C and the \(\mathrm{C{\equiv}C}\): it has 7 carbons (hept), with a propyl group on the middle carbon and two methyl groups.
Numbering from either end gives the multiple-bond locants {1,6}; the tie is broken by giving the double bond the lower locant, so C=C is C1 and the triple bond is C6-C7.
Then the methyls are at C3 and C5, and propyl at C4.
Name: 3,5-dimethyl-4-propylhept-1-en-6-yne.
Answer: (1) 3, 5-dimethyl-4-propylhept-1-en-6-yne
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