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- 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.(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*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 SWhich of the following has the largest dipole moment? (A) CH3-CEN (B) NF3 CN C=C NC H (С) CHз-CH2NH2 (D) H
- Consider HCN, which has three features in its IR spectrum: 946, 2380, and -1 3386 cm¹. (a) Sketch the motions of each normal mode and denote any degeneracies. (b) Assign each feature in the IR spectrum to a normal mode of the molecule. (c) Determine the zero-point energy of HCN.Select a single sp3–sp3 or sp3–sp2 bond from a linear portion of the molecule, identify it, and draw a Newman projection for it. Then draw a Newman projection for a 60 degree rotational isomer. List each rotational isomer as lower or higher energy. If your molecule is cyclic and has no linear portions, then draw the expected conformation of the cyclic portion of the molecule.There are two compounds of the formula Pt(NH3)2Cl2: The compound on the right is called cisplatin, and the compoundon the left is called transplatin. (a) Which compoundhas a nonzero dipole moment? (b) One of these compoundsis an anticancer drug, and one is inactive. The anticancerdrug works by its chloride ions undergoing a substitutionreaction with nitrogen atoms in DNA that are close together,forming a N—Pt—N angle of about 90°. Which compoundwould you predict to be the anticancer drug?
- Draw orbital pictures of the pi bonding in the following compounds:(a) CH3COCH3 (b) HCN (c) CH2“CH¬CHCHCNN2(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=192.54. (a) Use the simple one-electron molecular orbital method, including overlap, to calculate the energies of the molecular orbitals of the hydrogen molecule (H₂) in terms of a, ß and S? (b) Calculate & given that a = -13.6 eV, that S = 0.6, and that the lowest UV absorption energy is 12 eV. (c) Determine the ionisation energy of the bonding molecular orbital in H₂ ? [6 marks]