Question

what is the iupac name of the molecule? the name is: 3,6 - diethyl - 5 - isobutyl - 8 - methylnonane 2,3 - dimethyl - 5 - butyl - 8 - methylnonane 4,7 - diethyl - 5 - isobutyl - 2 - methylnonane 3,6 - diethyl - 5 - isopropyl - 8 - methylnonane

Explanation:

Step1: Identify longest carbon chain

The longest continuous chain has 9 carbons (nonane). We number from the end closest to substituents: right end (so the methyl at the end is at C2, not C8).

Step2: Label substituents

• C2: methyl group ($-\text{CH}_3$)
• C4: ethyl group ($-\text{CH}_2\text{CH}_3$)
• C5: isobutyl group ($-\text{CH}_2\text{CH}(\text{CH}_3)_2$)
• C7: ethyl group ($-\text{CH}_2\text{CH}_3$)

Step3: Order substituents alphabetically

Ethyl (di-), isobutyl, methyl; numbering matches the chain.

Answer:

C. 4,7-diethyl-5-isobutyl-2-methylnonane