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- 5. What are the spin system of the following compounds: (a) Cl₂CHCH2CHC₁₂ (b) CF3C=C-H (c) CI- H H H H -Br (d) H3C H CH39. 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.7. Consider the C=O stretching data for the following cyclic ketones: cyclopropane 1813 cm³¹; cyclobutanone 1791 cm³¹; cyclopentanone 1740 cm³¹. (a) which ketone has the strongest bond? (b) where in the trend would you expect the C=O stretch of cyclopropenone? (Use the hybridization information in the same way we used hybridization for C-H stretching.)
- (a) How many π molecular orbitals are present in deca-1,3,5,7,9-pentaene (CH2 = CH – OH = OH – CH = CH – OH = OH – CH = CH2)? (b) How many are bonding MOs and how many are antibonding MOs? (c) How many nodes are present in ψ1? (d) How many nodes are present in ψ10*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 C16) 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)
- Calculate the energy(kJ)whenphotons areejected from 3molesofhydrogen atomsupon an electron transition from n = 4to n = 2. ∆?=−??(1??2−1??When 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.Draw the structure of the two tertiary (3°) amines with molecular formula C6H15N that contain a group with 3 carbon atoms in the largest group. You do not have to consider stereochemistry. You do not have to explicitly draw H atoms.
- 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 SConvert the following line-bond structures into molecular formulas: (a) CH₂OH H H H H کی C= = с с C )-1 H (c) H、 N. с (=^ 0=C с FO Aspirin (acetylsalicylic acid) 0 )=0 с C C=0 OH H C || H CH3 ć с N Nicotine C 1 с с H HY C-C T H H CH3 )—I C H I I H (b) (d) HO H 4-C I HO HO H H₂ H-C C=0 Vitamin C (ascorbic acid) C=C CH₂OH C-O C C-C HO но| | H H OH OH Glucose H OH 112. (a) Calculate the spin only magnetic moment of: 0= V O SO₂