Chapter 22, Problem 90A

Interpretation Introduction

Interpretation: To tell whether the two enantiomers of limonene differ in physical properties.

Concept Introduction: Stereoisomers in which all the four groups on a carbon atom are different, thus enantiomers exist. This carbon is therefore termed an asymmetric carbon atom.

The pair of molecules that are mirror images of each other and are not superimposable are known as enantiomers.

Answer to Problem 90A

The properties such as color, density as well as boiling point are not similar for both enantiomers.

Explanation of Solution

In the case of limonene, there exist two enantiomers. The chemical as well physical properties of enantiomers are identical to each other. They only differ in the direction of plane-polarized light, taste, biological activity, and rate of reaction with different chiral reagents.

The right-handed limonene has a similar smell to that of orange while the left-handed limonene has a similar smell to pine trees. The other properties such as color, density as well as boiling point are not identical for both enantiomers.

Conclusion

Thus properties such as color, density as well as boiling point are not the same for both enantiomers.