Question

maxwell
elect the correct iupac name for the branched chain alkane.

the name is:
○ 7-ethyl-3,5,6-trimethyldecane
○ 4,6-ethyl-4,5-dimethylnonane
○ 4-ethyl-5,6,8-trimethyldecane
○ 4,6-diethyl-5,6-dimethylnonane

Explanation:

Step1: Identify longest carbon chain

The longest continuous chain has 10 carbons (root name: decane).

Step2: Number the chain from end with closest substituents

Numbering from the right gives substituents at positions 4,5,6,8; numbering from the left gives higher initial positions, so right-to-left numbering is correct.

Step3: List substituents with positions

• Ethyl group at C4, methyl groups at C5, C6, C8.

Step4: Match to correct option

Combine substituents in alphabetical order (ethyl before methyl): 4-ethyl-5,6,8-trimethyldecane.

Answer:

4-ethyl-5,6,8-trimethyldecane