Chapter 11.3, Problem 4P

Interpretation Introduction

Interpretation: The reason corresponding to the fact that an alkyne often has a slightly higher boiling point than an alkene of similar molecular weight is to be stated.

Concept introduction: The temperature at which a liquid starts changing its phase into a gas is known as boiling point.

The $sp$ hybridized carbon has higher s-character. Thus, it possesses higher electronegativity than $s{p}^2$ hybridized carbon because high s-character percentage corresponds to the higher electronegativity. The highly electronegative carbon that is $sp$ carbon will attract more bonded electrons that leads to the high concentration of negative charge. Thus, the direction of dipole moves towards the $sp$ carbon.