Chapter 2, Problem 2.66P

Interpretation Introduction

Interpretation:

It is to be explained that $\text{propan-1-ol}$${\text{(CH}}_{\text{3}}{\text{CH}}_{\text{2}}{\text{CH}}_{\text{2}}\text{OH)}$ and $\text{propan-2-ol}$ $\left[{\left({\text{CH}}_{\text{3}}\right)}_{\text{2}}\text{CHOH}\right]$ are both alcohols that have the same formula ${\text{(C}}_{\text{3}}{\text{H}}_{\text{8}}\text{O)}$ but have significantly different boiling points, i.e., $97.5°\text{C}$ for $\text{propan-1-ol}$ and $82°\text{C}$ for $\text{propan-2-ol}$.

Concept introduction:

Compounds with strong intermolecular forces have higher boiling points. The branching reduces the surface area available for intermolecular interactions due to compact structure. And the isomer having an extended shape has a higher boiling point than the branched isomer due to a larger surface area available for intermolecular interactions.