What is the systematic name for this compound?

Question

BlackTom AI · Accepted Answer

First, we need to determine the longest carbon chain in the provided structure to assign the base name. The molecule clearly contains a six-carbon chain when traced through the main path, making hexane the appropriate parent name.

Option 1: 3,4-dimethylpentane
This would imply a five-carbon main chain with two methyl substituents at C-3 and C-4. However, the structure shows a six-carbon continuous chain, so pentane as the parent is incorrect. The longest chain must be six carbons, not five.

Option 2: 2-methyl-3-methylpentane
This is not properly formatted; when there are two methyl substituents, the correct descriptor would be 2,3-dimethylpentane if the base chain were pentane. Since the longest chain is six carbons, this option is both misnamed for the given chain length and uses an incorrect parent.

Option 3: 3,4-dimethylhexane
This matches the six-carbon main chain with two methyl substituents located at the 3 and 4 positions. It is consistent with the typical naming convention: longest chain length (hexane) plus two methyl groups at the specified positions.

Option 4: 2,3-dimethylhexane
This would indicate two methyl substituents on the 2 and 3 positions of a six-carbon chain. While this is a valid name for a different arrangement of substituents, it does not correspond to the depicted substituent positions on the main chain in the given structure.

Option 5: 2,3-dimethylpentane
This suggests a five-carbon main chain with methyl groups at 2 and 3. Again, the image shows a six-carbon main chain, so this option misidentifies both the parent chain and the substituent positions.

In summary, the key criteria are identifying the longest carbon backbone (six carbons) and the exact locations of the methyl substituents on that chain. Among the choices, 3,4-dimethylhexane correctly reflects a six-carbon main chain with methyl groups at C-3 and C-4, whereas the other options either use an incorrect parent chain length or place the substituents at different positions.

What is the systematic name for this compound?

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