Chapter 23.1, Problem 6LC

Interpretation Introduction

Interpretation : To compare the boiling points of Ethane and chloroethane.

Concept Introduction : The boiling point is the point or temperature where the liquid turns into vapor. If any substituents are present or attached to a compound then the boiling point will increase as the weight of molecular weight increases.

Answer to Problem 6LC

Chloroethane has a higher boiling point as compared to Ethane.

Explanation of Solution

The boiling point of ethane is ${\text{-89}}^{\text{0}}\text{C}$ whereas, the boiling point of Chloroethane is ${12.27}^{\text{0}}\text{C}$ . The greater the molecular weight of a compound stronger will be the dispersion or van der Waals forces between them. The molecular weight of Chloroethane is more than that or ethane; therefore, Chloroethane will have stronger van der Waals forces of attraction and hence will have a higher boiling point than ethane.

Conclusion

Due to the presence of the substituent, the molecular weight will increase. In this case, chlorine is attached to ethane, and hence, molecular weight increases so as the boiling point.