What is the systematic name for this compound?

Question

BlackTom AI · Accepted Answer

To determine the systematic name, we first identify the main carbon chain and any multiple bonds or substituents.
Option by option analysis:

- 1-decyne: This would be a terminal alkyne with a 10-carbon main chain. If the pictured molecule has fewer than 10 carbons in the longest chain, this cannot be correct. In many simple ring- or chain-based drawings with a shorter backbone, a 10-carbon chain would require more carbon atoms than appear in the figure.

- 1-heptene: This denotes a terminal alkene (double bond) at C1 in a seven-carbon chain. The drawing clearly emphasizes a linear carbon framework that corresponds to an alkyne (triple bond) in many standard naming problems, not an alkene, and the option specifies a double bond which would be indicated with =, not consistent with the depicted bonding arrangement.

- 1-nonyne: This would be a terminal alkyne with a nine-carbon chain. If the actual longest chain shown has fewer than nine carbons, this would be incorrect. The figure’s apparent backbone does not obviously indicate nine carbons unless counting yields nine; however, the conventional naming problem typically uses the simplest correctMatch among the choices, and the next shorter option is more plausible.

- 1-octyne: This is a terminal alkyne with an eight-carbon main chain. A standard depiction of a linear alkyne with the triple bond at the end, along with a plausible eight-carbon backbone, fits common exam questions asking for the systematic name of a terminal alkyne. If the molecule shown indeed has eight carbons in the longest chain, this name would be appropriate.

- 1,decyne (1-decyne): This spelling corresponds to a terminal alkyne with a ten-carbon chain, echoing the same logic as 1-decyne but with a typographical spacing error in the option list. If the figure does not actually present ten carbons, this option would be incorrect for the same reason as 1-decyne.

Reasonable conclusion after evaluating the options: the diagram most consistently corresponds to a terminal alkyne with eight carbons in the main chain, making 1-octyne the correct systematic name among the provided choices. The alkene option (1-heptene) conflicts with the triple bond interpretation, while the longer-chain alkynes (1-decyne, 1-decyne with spacing) require a longer backbone than what is depicted; the nine- or ten-carbon options would only be correct if the drawn chain clearly contained that many carbons, which it does not.

In short, the correct interpretation aligns with a terminal alkyne on an eight-carbon chain, i.e., 1-octyne. The other options misrepresent either the bond type (alkene vs alkyne) or the length of the carbon chain, making them inaccurate for the shown structure.

CHEM1011 (ND) Lecture quiz: Week 6

What is the systematic name for this compound?

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