Problems and exercisesStructure and Nomenclature

1. General formula

Write the molecular formulas of cyclopentane, methylcyclohexane and decalin (two fused six-membered rings). How many hydrogens does the formula lose for each ring?

2. Name these cycloalkanes

1. A cyclohexane bearing an ethyl group
2. A cyclopentane with two methyl groups on adjacent carbons
3. A cyclohexane with an ethyl and a methyl group at positions 1 and 3
4. A cyclobutane bearing an isopropyl group

3. Cis/trans isomerism

Which of these compounds show geometrical isomerism?

1. 1,1-Dimethylcyclohexane
2. 1,2-Dimethylcyclopropane
3. 1,4-Dimethylcyclohexane
4. Methylcyclopentane

4. Stereoisomers of 1,2-dimethylcyclopropane

How many stereoisomers does 1,2-dimethylcyclopropane have? Is any of them chiral?