List the HOMO and LUMO for each of the following molecules. Please choose from one of these options for each assignment: nonbonding, o,o*,π, or T*. It's not necessary in this question to specify the specific atoms involved. (a) H3C-N H3C CH3 HOMO: LUMO: (b) HOMO: LUMO:
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- The unsaturation number or degree of unsaturation (U) can be used to determine the number of rings and multiple bonds in a compound from its molecular formula. Given a structure, you can determine the number of hydrogens without having to count them explicitly. Consider three compounds and their degree of unsaturation. (a) A compound A has the molecular formula C7H13ClN2OC7H13ClN2O. How many rings and/or π bonds does it contain?dichloromethyl vinylsulfideCHCL2-S-CH=CH2 comment very generally on bond length in the molecule. (also point out/ explain unusual or unexpected bond lengths)2. For each molecule below, determine and write the formal charge on each atom that has one. Do any of the molecules have a net formal charge that is not zero? All unshared valence electrons are shown in these Lewis structures. (a) :Ö: H₂C-N-CH3 CH3 trimethylamine oxide (b) ozone (c) H-C-H methylene (d) H H₂C-C H ethyl radical
- Assign absolute configurations as R or S to each of the following compounds. CI D) Br | NH2 ....... Br E) CH,CH3 F) Br но .........How many equivalent hydrogens are in CH2BrCl? (i.e., do they have identical environments with respect to the other atoms adjacent to themselves). A) 0 B) 3 C) 1 D) 2i) ii) iii) d. Assign the following molecules as either E, Z or neither. Note: there may not be one of each. HO H₂C- Br O Br Br O Br Br -CH3
- How many kinds of H’s are there in the isomers of dimethylcyclopropane? Draw theirstructures and assign the different protons as a, b, c, etc.or each of the following molecules, construct the MOS from the 2p, atomic orbitals perpendicular to the plane of the carbon atoms. (a) Cyclobutadiene HC=CH НС—СН HC=CH НС —СH (b) Allyl radical H H H H C=C •C-C, H C-H H C-H H H Indicate which, if any, of these orbitals have identical ener- gies from symmetry considerations. Show the number of electrons occupying each w MO in the ground state, and indicate whether either or both of the molecules are para- magnetic. Assume that the C atoms in the allyl radical are all sp? hybridized. Activate io to SDetermine whether the following pairs of structures are actually different compounds or simply resonance forms of the same compounds. 1-41 0 0 and and (b) (a) O +0-H O 0-H and and (d) +NH₂ 0 NH₂ CH,-!-H + (e) CH₂=C H and CH₂-CH (Đ) CH–C−NH, and CH3–C=NH, + (g) CH₂=CH-CH₂ and CH₂-CH=CH₂ (h) CH₂=C=0 and H=C=C—OH Ο Η 0 H 0 H +O-H (i)/H-C-C-H and H-C=C-H (j) H-C-H and H¬C-H g H H O- 유 0 « -l- + (k) H-C-NH₂ and H-C=NH₂ (1) CH₂-C-CH=CH₂ and CH₂-C=CH-CH₂
- 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) C9H12 (b) C,H40| (c) C,H,N2The longest wavelength electronic transition in simple unsaturated hydrocarbons corresponds to a transition from the highest occupied molecular orbita l (HOMO) to the lowest unoccupied molecular orbita l (LUMO) . Predict the energy of the HOMO to LUMO separation in (a) ethane. (b) butadiene. and (c) benzene.Which molecules have (z)- ? configuration H3C CH,CH, Br, HO;C CH;CH, HạC CH3 Br H3C CH;CH, H co,H IV | only .a III and IV .b I and II .C III only .d I and III .e