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- 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,N2(1R)-1-chloro-1-cyclohexylpropan-1-ol Draw the bond-line structure of the said compoundWhich of the following bond-line structures corresponds to the Newman projection shown? Br J... (A) Br I H. Br "Ω (B) CH3 CH3 CI H Br (C) Br CI (D)
- 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 Sβ-Carotene is the compound responsiblefor the orange color of carrots and is theprecursor to vitamin A. Judging from theLewis structure shown here, how many πbonds does β-carotene have?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 C1
- 1. Molecule A, shown below is closely related to the drug NGD-4715, which exhibits anti- depressant effects in animal models. Which of the following best describes the orbital overlap between the C and N atoms that provides the G-bond in the cyano group (labelled "e")? (A) C sp - N sp (D) Cp-Np OA OB OC OD OH (B) C sp'-N p (E) C sp - N sp¹ Molecule A (C) C sp - N sp6. Set up the secular determinant for cyclobutadiene using Huckel approximation (a) solve for the energies ofn molecular orbitals (b) calculate the Er. (c) calculate the delocalization energy (d) T-bond formation energy where 4(a + B) is the n-bond formation energy for two localized n- bond4) How many nodes, other than the node coincident with the molecular plane, are found in the highest energy л MO of 1,3-butadiene?
- Which of the following arrangements of p atomic orbitals gives the highest energy p-bonding molecular orbital of 1,3- butadiene?Which bond-line structure is represented by the Newman projection below?9. Consider the ethyl iodide molecule, CH CH₂, which of the statements below is correct? (A) CH, protons are more deshielded. (B) The energy gap between a and ß spin states of CH₂ protons is smaller than the counterpart of CH; protons. (C) The electronegative element I shields the CH₂ protons. (D) None of the above.