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Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074

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BuyFindarrow_forward

Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074
Textbook Problem

Compare the boiling points of the various isomeric hydrocarbons shown in the table below. Notice the relationship between boiling point and structure; branched-chain hydrocarbons have lower boiling points than the unbranched isomer. Speculate on possible reasons for this trend. Why might the intermolecular forces be slightly different in these compounds?

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Interpretation Introduction

Interpretation:

Relation between boiling point and branched chain hydrocarbon has to be explained.

Concept Introduction: If intermolecular force is small the vapor pressure of the substance is high and the boiling point will be low.

The boiling point of a liquid is the temperature at which its vapor pressure is equal to the external pressure.

The more the branching in the hydrocarbon, the lower is the boiling point.

Explanation

                Figure 1

From hexane to 2,2-dimethylbutane the boiling point decreases. Thus is due the branching in the hydrocarbon is more, the boiling point boiling point also decreases, implies that the weaker induced dipole-induced dipole forces

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