Question

select the compound whose root name is hexane.
2nd attempt
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choose one:

Explanation:

To determine the compound with the root name "hexane", we analyze the longest carbon chain (parent chain) for each structure:

1. Recall that "hexane" indicates a parent chain with 6 carbon atoms (since "hex-" means 6 in organic nomenclature, and "-ane" denotes an alkane, a saturated hydrocarbon with single bonds).
2. For each option, identify the longest continuous carbon chain:

• The fifth structure (the one with a 6 - carbon parent chain, after counting the longest chain of connected carbons) has a parent chain of 6 carbons. Other structures have longer (e.g., 7 or more) or shorter parent chains.

Answer:

The fifth compound (the one with the 6 - carbon parent chain, typically the structure with a hexagonal - like or straight - chain - with - branches arrangement that has 6 carbons in the longest chain) is the one with the root name hexane.

(Note: Since the exact structure labels aren’t provided, the key is identifying the structure where the longest carbon chain has 6 atoms. If we assume the fifth option in the list has a 6 - carbon parent chain, that is the correct choice.)