1. The molecule is a steroid, specifically estradiol (a form of estrogen). It contains four fused rings (three six-membered and one five-membered) with hydroxyl groups at positions 3 and 17.
2. The correct answer is the third structure from the left in the top row (the cyclohexane ring with two methyl substituents).
3. The first pair are constitutional isomers (same molecular formula, different connectivity). The second pair are identical molecules (same connectivity and spatial arrangement). The third pair are enantiomers (non-superimposable mirror images).
4. The first pair are constitutional isomers. The second pair are stereoisomers (specifically diastereomers, as they are not mirror images). The third pair are identical molecules.
5. The first pair are constitutional isomers. The second pair are stereoisomers (enantiomers). The third pair are identical molecules.
Parent Tip: Review the logic above to help your child master the concept of isomers worksheet.
