Question

what is the iupac name of this molecule? 5 - ethyl - 3,5 - dimethylhexane 2,4 - dimethyl - 2 - ethylhexane 2 - ethyl - 2,4 - dimethylhexane 3,5,5 - trimethylheptane 3,3,5 - trimethylheptane

Explanation:

Step1: Identify the longest carbon - chain

The longest continuous carbon - chain has 7 carbon atoms, so the parent alkane is heptane.

Step2: Number the carbon - chain

Number the carbon - chain to give the substituents the lowest possible numbers. Starting from the end closest to a substituent, we find that there are two methyl groups on the 3rd carbon and one methyl group on the 5th carbon.

Step3: Name the substituents and write the IUPAC name

The substituents are methyl groups. We use the prefixes di - (for two) and tri - (for three). The IUPAC name is 3,3,5 - trimethylheptane.

Answer:

3,3,5 - trimethylheptane