Organic Chemistry
Organic Chemistry
2nd Edition
ISBN: 9781118452288
Author: David R. Klein
Publisher: WILEY
Question
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Chapter 4, Problem 52PP
Interpretation Introduction

Interpretation:

The energy cost associated with the eclipsing interaction between a bromine atom and a hydrogen atom in bromoethane is needed to be calculated on basis of given information the barrier to rotation of bromoethane is 15 kJ/mol.

Concept introduction:

Conformations are arising due to the free rotation of CC bond. These rotations are measured by dihedral angle; it is the angle between two atoms attached to two different carbons of CC rotation in Newman projection.

The most and least energy occupied conformers are eclipsed and staggered, which are having a dihedral angle of ‘0’ and ‘60’ degree respectively.

The torsional strain and steric interaction between atoms of eclipsed conformations makes them more energized as compared to staggered conformations.

The CC bond rotation from staggered to eclipsed is called barrier to rotation. It requires some cost of energy. It depends upon eclipsed interaction energies of each atom attached to CC carbon atom.

The energy cost for H/H eclipsed interaction is 4 kJ/mol.

To find: the energy cost associated with the eclipsing interaction between a bromine atom and a hydrogen atom in bromoethane.

Blurred answer

Chapter 4 Solutions

Organic Chemistry

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