Consider the rotational energy diagram: 60 120 180 240 300 360 Dihedral angle (degrees) Which of the following statements is true? O The rotational energy diagram could be for the molecule 2-methylbutane sighting from C2 to C3. O The conformations with dihedral angles of 0°, 120° and 240° are staggered. O The conformers with dihedral angles of 120° and 240° have gauche interactions. O The conformer at 60° has steric strain and torsional strain. O The conformers at 60° and 300° must have at least one gauche interaction. Relative Energy

Consider the rotational energy diagram: 60 120 180 240 300 360 Dihedral angle (degrees) Which of the following statements is true? O The rotational energy diagram could be for the molecule 2-methylbutane sighting from C2 to C3. O The conformations with dihedral angles of 0°, 120° and 240° are staggered. O The conformers with dihedral angles of 120° and 240° have gauche interactions. O The conformer at 60° has steric strain and torsional strain. O The conformers at 60° and 300° must have at least one gauche interaction. Relative Energy

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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5. Assume that the types of strain in the rotation about the C1-C2 bond in 1,2-dibromopropane have the following values. •Torsional strain = 20 kJ/mol •Steric strain between two Br substituents gauche = 13 kJ/mol •Steric strain between two Br substituents eclipsed = 16 kJ/mol •Steric strain between Br and CH3 substituents gauche = 8 kJ/mol •Steric strain between Br and CH3 substituents eclipsed (a) Perform a conformational analysis about the C1-C2 bond, analogous to the diagram in Figures 4-4 and 4-7 (Karty). Draw a full rotational energy profile (add E values in kJ/mol on y-axis) drawing each eclipsed and staggered conformation as Newmann projections i.e. 60° rotations for complete rotation about the C1-C2 bond. = 10 kJ/mol. E (kJ/mol) 0° 360 °
Consider the graph below, which plot of the relative energies of the various conformations of butane, viewed through C2-C3 bond. The conformations corresponding to 180° is: ... |- F F- 0° 60° 120° 180° 240° 300° 360° Angle of rotation (A) eclipsed, less stable than the conformation at 0° (B eclipsed, more stable than the conformation at 0° C staggered and gauche (D) staggered and anti Retative onergy
Question 19 What is the nucleophilic site in each of the following molecules? H₂C CH3 H₂N-CH3 H₂C-CH3 III II A) I: hydrogen; II: nitrogen; III: carbon with lone pair B) I: oxygen; II: nitrogen; III: carbon without lone pair C) I: oxygen; II: nitrogen; III: carbon with lone pair D) I: oxygen; II: carbon; III: carbon with lone pair E) I: carbon; II: nitrogen; III: hydrogen OAA О В.В OCC OD.D 0 I OEE
Consider the graph below, which is a plot of the relative energies of three various conformations of hexane, viewed through the C2-C3 bond. The conformations corresponding to the 60° and 300° are I80 240 300 360 Angle of rotation more stable than the conformation at 180° O staggered and gauche O staggered and anti Eclipsed
Specify the types of strain that destabilize the conformer shown below. Hint: All bonds not explicitly shown are in the staggered conformation. 1. Torsional strain 2. Angle (ring) strain 3. Steric (van der Waals) strain H H CH₂
Consider the following conformer and the ring flip that occurs: ring flip conformer B conformer A Which of the following statements is true? O The substituents are positioned trans with respect to each other. At equilibrium, there will be a greater amount of conformer A compared to conformer B. Conformer B has no 1,3-diaxial interactions. O Conformer A has ring strain. O Conformer B has torsional strain.
2. Draw Newman projections (= 60° increments) of the conformations of 2R-bromobutane from C2-C3. Indicate anti, gauche and eclipsed conformations. Indicate the most and least stable conformations.
Which statement describes the conformations below? H₂CCI I H. H CI CH3 'Н H The staggered conformation on the left is more stable. O The staggered conformation on the right is more stable. The eclipsed conformation on the left is more stable. The eclipsed conformation on the right is more stable.
8. In the lowest energy conformation of cyclohexane, is the methyl group at C2 in the axial or equatorial position in this molecule? Using the Cahn Ingold Prelog system, determine the configuration of the chirality centers indicated in the lowest energy conformation. CH3 Sa 2 CH3 CH3
4 Practice 2 3-9 4.8 Conformational Analysis of Butane The graph below represents the relative energies of the conformations of butane: ww B Relative energy -1- —— 0° 60° 120° 180° 240° 300° 360° Angle of rotation Select the Newman projection that corresponds with position C on the graph (an angle of rotation of 120 degrees). HA 3 H I I I I # CH3 CH 3 CH 3 CH3 -I H HH CH3 CH3 CH3 80⁰0 CH3 H I I Н 4 000 000 % 6 MacBook Air 7 8 DIL FB 9 0
2. Draw two Neman projections of the molecule 4,5-diethyloctane looking down the C4- C5 bond. Use the labels and figures below as a start for your drawing. Fill in the blanks with the word or words that best describe that structure as needed. This is the conformation and it is highest in relative energy This is the anti conformation and it is in relative energy
Cyclohexane structures can have two chair conformations. Draw the alternate conformation of the structure shown below. Rotations of the structure are not allowed. CH3 Select to Draw Chair Flip ОН CI