Looking at this eighth structure, I can see it's a branched alkane with a main chain of 4 carbons (butane). There is a methyl group attached to the second carbon and an ethyl group also attached to the second carbon. Now that I've examined all the structures, I'll provide the complete solution with the correct IUPAC names for each alkane.
Based on my analysis of each structure:
1. First structure: Main chain is 4 carbons (butane) with a methyl group on carbon 2. This is 2-methylbutane.
2. Second structure: Main chain is 5 carbons (pentane) with two methyl groups on carbon 2. This is 2,2-dimethylpentane.
3. Third structure: Main chain is 6 carbons (hexane) with a methyl group on carbon 2 and an ethyl group on carbon 3. This is 3-ethyl-2-methylhexane.
4. Fourth structure: Main chain is 6 carbons (hexane) with a methyl group on carbon 2 and an ethyl group on carbon 3. This is 3-ethyl-2-methylhexane.
5. Fifth structure: Main chain is 6 carbons (hexane) with methyl groups on carbons 2 and 4. This is 2,4-dimethylhexane.
6. Sixth structure: Main chain is 5 carbons (pentane) with methyl groups on carbons 2 and 3. This is 2,3-dimethylpentane.
7. Seventh structure: Main chain is 4 carbons (butane) with two methyl groups on carbon 2. This is 2,2-dimethylbutane.
8. Eighth structure: Main chain is 4 carbons (butane) with a methyl group and an ethyl group on carbon 2. This is 2-ethyl-2-methylbutane.
The solution to the problem is to correctly name each of these branched alkanes according to IUPAC nomenclature rules, which I have done above.
Parent Tip: Review the logic above to help your child master the concept of naming alkanes worksheet with answers.
