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- 7. Assign E or Z configuration to the following molecules: (A) (B) (C) (D) (E) I = Z; II = E I=E: II = Z I= E; II = E I=Z; II = Z I= E; II is neither E nor Z OH I II C1please help sove this chemistry questionWhen B-carotene is oxidised in vivo, it breaks in half and forms two molecules of retinal (vitamin A), which is a precursor to the pigment in the retina responsible for vision. The conjugated system of retinal consists of eleven C atoms and one O atom; see the structure of the molecule here: H3C CH3 ÇH3 ÇH3 `CH3 In the ground state of retinal, each level up to n = 6 is occupied by two electrons. Assuming an average inter-nuclear distance of 140 pm, use the particle-in-a-box model to calculate: a. the separation in energy between the ground state and first excited state in which one electron occupies the state with n = 7, and b. the frequency of the radiation required to produce a transition between these two states.
- 6) Given below are the molecule BH3, its character table, and its molecular orbital diagram. By convention, the z-axis lies along the principal rotation axis: (a) What Mulliken symbol represents the symmetry of the MOs I-V? (b) Which of the given atomic orbitals on boron would match the MOS I-V? (c) Depict the in-phase (bonding) and out-of-phase (anti-bonding) of these MOS. B 2p orbitals B 2s orbitals II H 2s orbitals D₂ A, A₂' A," E" 1 1 2 1 1 2 2C, 3C₂ 0₂ 25, 1 1 1 1 1 -1 1 -1 1 -1 0 1 2 -1 -1 30, 1 1 -1 R₂ -1 0 -1 -1 -1 1 1 0 (x, y) (R., R.) x+y²,2² (x²-y, xy) (xz, yz)The degree of unsaturation, or index of hydrogen deficiency, is the number of pi bonds plus rings in a molecule. Specify the degree of unsaturation (index of hydrogen deficiency) of the following formulas: (a) C24H24 (b) C8H1002 (c) CgH8N₂3. According to the Hammond Postulate, what does transition state 3 (TS3) most closely resemble? First choice: Second choice: AG (a) TS2 (b) P (c) 12 (d) 11 TS2 TS1 M 11 Reaction Coordinate 12 TS3
- Explain [3,3] Sigmatropic Rearrangements ?Giventhefollowingsetofreactionsandtheirenthalpies,drawtheBorn-Habercyclefortheformationof LiCl(s)anddeterminethelatticeenergyforLiCl.Reactions:H (in kJ)(1)Li(s)Li(g);Hs= 161;(2) Li(g)Li+(g)+e–;IE= 520;(3) ½Cl2(g)Cl(g);½BE =121.5;(4)Cl(g)+ e–Cl–(g);EA= –349;(5)Li+(g)+ Cl–(g)LiCl(s);UL= ?(UL= latticeenergy)(6) Li(s)+ ½ Cl2(g)LiCl(s);Hof=–408.6._______________________________________________________________________________Draw orbital pictures of the pi bonding in the following compounds:(a) CH3COCH3 (b) HCN (c) CH2“CH¬CHCHCN
- Consider the three following molecules and answer the questions below.HC≡CHH2C=CH2H3C-CH3 (3 conformers with different symmetry)(a) For each molecule, including all conformers as indicated, draw the molecule, assign it toits point group, and draw on the diagram the symmetry elements that were used to makethe assignment. State in each case whether or not the species is dipolar and/or chiral.(b) If one hydrogen atom in each molecule is substituted by a chlorine atom, sketch the newmolecules and assign them to their point group. For this set of mono-chloro compounds: state the most common point group state how many are chiral state how many are dipolar state which molecule/conformer has the highest symmetry point group state which molecule/conformer has the lowest symmetry point group identify which of these molecules/conformers have three different H atomenvironments(c) For the dichlorinated versions of the molecules/conformers considered in part (a): state the most common point…Choose the correct option. 14.How many electrons are present in the nonbonding π molecular orbital of the allyl anion?A)0B)1C)2D)3E)4 15.Which of the following statements concerning electrocyclic reactions is correct?A)The ground state HOMO of a compound with an even number of conjugated double bonds is asymmetric.B)The allowed mode of ring closure under thermal conditions for a molecule containing an even number of conjugated double bonds is disrotatory.C)The allowed mode of ring closure under photochemical conditions for a molecule containing an odd number of conjugated double bonds is disrotatory.D)both B and CE)none of the above 16.Under thermal conditions,(2E,4Z)-hexadiene undergoes a ___ ring closure to yield ___.A)conrotatory,cis-3,4-dimethylcyclobuteneB)conrotatory,trans-3,4-dimethylcyclobuteneC)disrotatory,cis-3,4-dimethylcyclobuteneD)disrotatory,trans-3,4-dimethylcyclobutene 17.Under photochemical conditions,(2E,4Z)-hexadiene undergoes a ___ ring closure to yield…N2(g) deltaH(kj/mol)=0, deltaG(kj/mol)=0, S(J/mol K)=1891.6 H2(g) deltaH=0, deltaG=0, S=130.7 NH3(g) deltaH=-46.1, deltaG=-16.5, S=192.5