Question

please answer ALL parts of the question

Motion: Conformations by Rotations aswer the following questions about energy barrier to convert a gauche conformation into its "NTEGRATE THE SKILL -.4 a) Use the energy diagram in Figure 3.3 to answer the following 9 1,2-dichloroethane. i) What is the height of the energy barrier to convert anti-conformation? ii) What is the height of the energy barrier to convert an anti-c f the energy barrier to convert an anti-conformation into its gauche conformation? iii) What is the height of the energy barrier to convert a gauche con rgy barrier to convert a gauche conformation with a torsional angle of 60° into a gauche conformation with a 300° torsional angle? b) Plot a graph of strain energy as a function of the torsion angle defined by the four ato 1,2-dichloroethane shown here in blue. How does this graph differ from the one in Figure 3.5 where the CI-C-C-Cl torsion angle is used? Hai

Answer 1

DATELLI (Gauche y anti) i) The energy of gauche is 0.6 to Convert it into anti Conformation, an activation energy is required to rotate 600 and to reach eclipsed Conformation! The energy of Eclipsed conformation - 5 kcallmol. The heigh ef barnier - Peale of barrier - stain energy of gauch Heigh of barrier = 5 kcal/mol - 0.6 kcal/mol = 4.4 kcal/mol. Neight of barrier 4.4 kal/mol tleigh of barrier = Peale of barrier - Stain energy of anti-Conformiton Cantite Gauche = skal lond - ol Callnu = 5lllml. Height of barrier 5 kcal/mol.) Gauche (60°) Gauche (30). Height of barrier = Peak of barrier - stan energy of 60 Conormal - (8.8- 0.6) kallmol J Height of barrier = 8.2 kcallmol.) " na There won't be any difference, except the peate angle at which beald would occurl

fully eclipsed 120 120° CTI gauche (T 600 CT) Touch ач з canti Conforme - ecloped (IV) gauche 360° (VI 2400 (I) s mined fully ecliped: El call eplipsed gauch (1) anti (Il gauche ! 60 120 10 20 300 360 a-e-c-e torsia The conly difference is the starting as ending of graph, at starts with gauch and ends at gauche