Question

1. Build a model of 2-methylpentane. Sight down the C-2 to C-3 bond. a) Draw all possible Newman projections (0°-360°) for this molecule. b) Which projection(s) is/are the lowest energy and which is/are the highest energy? Refer to the table below for some help. Interaction Cause Energy Cost H-H eclipsed Torsional Strain 1.0 kcal/mol H-CH$_3$ eclipsed Mostly Torsional 1.4 kcal/mol CH$_3$-CH$_3$ eclipsed Torsional + Steric 2.6 kcal/mol CH$_3$-CH$_3$ gauche Steric strain 0.9 kcal/mol c) Without calculating exact energy costs, plot potential energy vs. rotation angle for this molecule.

          1. Build a model of 2-methylpentane. Sight down the C-2 to C-3 bond.
a) Draw all possible Newman projections (0°-360°) for this molecule.
b) Which projection(s) is/are the lowest energy and which is/are the highest energy?
Refer to the table below for some help.
Interaction	Cause	Energy Cost
H-H eclipsed	Torsional Strain	1.0 kcal/mol
H-CH$_3$ eclipsed	Mostly Torsional	1.4 kcal/mol
CH$_3$-CH$_3$ eclipsed	Torsional + Steric	2.6 kcal/mol
CH$_3$-CH$_3$ gauche	Steric strain	0.9 kcal/mol
c) Without calculating exact energy costs, plot potential energy vs. rotation angle for
this molecule.

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1. Build a model of 2-methylpentane. Sight down the C-2 to C-3 bond.
a) Draw all possible Newman projections (0°-360°) for this molecule.
b) Which projection(s) is/are the lowest energy and which is/are the highest energy?
Refer to the table below for some help.
Interaction Cause Energy Cost
H-H eclipsed Torsional Strain 1.0 kcal/mol
H-CH3 eclipsed Mostly Torsional 1.4 kcal/mol
CH3-CH3 eclipsed Torsional + Steric 2.6 kcal/mol
CH3-CH3 gauche Steric strain 0.9 kcal/mol
c) Without calculating exact energy costs, plot potential energy vs. rotation angle for
this molecule.

Added by Sean M.

Chemistry: Structure and Properties

Nivaldo Tro 2nd Edition

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Solved by Expert Alkendra Singh

12/20/2021

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Place the methyl group (CH3) at C-2 in the front and the rest of the molecule behind it. Show more…

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Build a model of 2-methylpentane. Sight down the C-2 to C-3 bond. a) Draw all possible Newman projections (0deg -360deg ) for this molecule. b) Which projection(s) is/are the lowest energy and which is/are the highest energy? Refer to the table below for some help. able[[Interaction,Cause,Energy Cost],[H-H eclipsed,Torsional Strain,1.0kca(l)/(m)ol this molecule. CH3-CH3 gauche CH3-CH3eclipsed H-CH eclipsed H-H eclipsed Interaction Refer to the table below for some help. Steric strain Torsional+Steric Mostly Torsional Torsional Strain a)Draw all possible Newman projections (0-360') for this molecule. 1.Build a model of 2-methylpentane. Sight down the C-2 to C-3 bond. Cause 0.9 kcal/mol 2.6 kcal/mol 1.4 kcal/mol 1.0 kcal/mol Energy Cost

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