Given the structure shown in mc012-1.jpg, what is the correct IUPAC name for the molecule?

• A. $3-\mathrm{hexene}$
• B. $3-\mathrm{heptyne}$
• C. $3-\mathrm{hexyne}$
• D. $3-\mathrm{heptene}$

Answer: (D)

Verified step by step guidance

1. Identify the longest carbon chain in the molecule that contains both the double and triple bonds, as the parent hydrocarbon name depends on this chain length.
2. Number the carbon chain from the end nearest to the first multiple bond (double or triple) to give the lowest possible numbers to the double and triple bonds according to IUPAC rules.
3. Determine the position of the double bond and the triple bond along the chain by their carbon numbers; the suffixes '-ene' and '-yne' indicate double and triple bonds respectively.
4. Assign the correct parent name based on the number of carbons in the longest chain and the presence of the double bond; for example, a 7-carbon chain with a double bond is 'heptene'.
5. Combine the position number and the parent name to form the correct IUPAC name, ensuring the double bond position is indicated (e.g., '3-heptene' if the double bond is on carbon 3).