From its structure (shown below), name this compound:

Question

BlackTom AI · Accepted Answer

Choose the longest continuous carbon chain first: it contains eight carbons, so the parent name is octane. (Key IUPAC points: pick the longest chain, number to give substituents the lowest possible set of locants, name substituents and list them alphabetically in the final name.)

Step-by-step reasoning and counting:
1. Identify the longest chain by following the continuous path that includes the maximum number of carbons through the branched center — this yields 8 carbons → octane.
2. Number the octane chain from the end that gives the substituents the lowest possible locants. Numbering from the left-hand end gives substituents at carbons 3 and 4; numbering from the right would give them at 5 and 6. The set (3,4) is lower than (5,6), so use 1→8 left to right.
3. Determine substituents and their positions: at C3 there is a methyl group (–CH3) and at C4 there is an ethyl group (–CH2CH3). Thus the substituents are “3-methyl” and “4-ethyl.”
4. Apply alphabetical ordering for the substituent names when writing the combined substituent prefix: “ethyl” comes before “methyl,” so list as “4-ethyl-3-methyl.” Combine with parent name: 4-ethyl-3-methyloctane.

Intermediate counts shown explicitly:
- Main chain positions: 1,2,3(Methyl),4(Ethyl),5,6,7,8 → parent = octane.
- Locant set chosen = {3,4} (lowest possible); substituent identities = methyl at 3, ethyl at 4.

Why this is correct:
- The longest chain contains 8 C (octane); numbering chosen minimizes locants (3 and 4); alphabetical order yields ethyl before methyl. So the correct IUPAC name is 4-ethyl-3-methyloctane.

Why the other options are incorrect:
- (a) 3-butylheptane assumes a seven-carbon parent with a butyl substituent; the structure actually has an eight-carbon parent and two smaller substituents (methyl and ethyl), not a butyl on heptane.
- (b) 2,3-diethylheptane implies two ethyl groups on a seven-carbon chain; our structure has one ethyl and one methyl on an eight-carbon chain.
- (c) 3-butyl-4-methylhexane likewise assumes a six-carbon parent with a butyl substituent and a methyl; again this does not match the actual substituents or longest chain length.

Therefore the correct name is 4-ethyl-3-methyloctane, matching answer d.

From its structure (shown below), name this compound:Single choice

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