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- Write the types of electronic transitions possible for following compounds : (4)i. Cyclohexane ii. Acetaldehydeiii. Dimethyl ether iv. Triethyl amine4G I 5:53 2.30 O Yo 40 52% KB/s 1. The C-C stretch in allene (H,C-C=CH,) is about 1650 cm'; the C-H stretch is about 3,100 cm". Calculate the corresponding wavelengths (in nm) and energies (in kJ/mol) of these vibrations. () IIIn f-element compounds like Nd3+, there are typically large energy splittings between J values, and absorption spectra show transitions between different J values. How many transitions are there in Nd3+ to excited states with different / values but the same L and S values as the ground state? A. O В. 1 С. 2 D.3 ) E. 4 F. More information is needed O O O O O
- MW is 98 1HNMR: 1.7 quintet, 1.8 quintet, 2.3 triplet What molecule is this?Tritium (abbreviated T has atomic mass 3.0) is one of the heavier isotopes of hydrogen (atomic mass 1.0). The C-H stretching frequency in methane (CH4) occurs at 3020 cm-l in the infrared spectrum. Predict the approximate frequency of the C-T stretch in tritiomethane (CH3T). Select one: a. 3660 cm- b. 1875 cm-1 c. 4017 cm-1 d. 6040 cm e. 3020 cm-1_11. What is the correct configuration for the following compound? Br ト A. (2R,3S) В. (2S,3S) C. (2R,3R) D. (2S,3R)
- 5. Calculate wavenumber for C=C and C=C by Hook's law. stronger bond higher frequency f force constant v =k/m Hooke's law M=mass k = constant smaller mass -higher frequency The force constant (f) of C=C 10 x 105 dyne/cm and C=C, 15 x 105 dyne/cm The mass (m) is the mass of atoms (or weights). The smaller the value of m, the higher the V of vibration. CH3O. H. HO capsaicin (spicy component of hot peppers)The highest occupied molecular orbital of a molecule isabbreviated as the HOMO. The lowest unoccupied molecularorbital in a molecule is called the LUMO. Experimentally,one can measure the difference in energy betweenthe HOMO and LUMO by taking the electronic absorption(UV-visible) spectrum of the molecule. Peaks in theelectronic absorption spectrum can be labeled as π 2p-π 2p*,σ2s-σ2s*, and so on, corresponding to electrons being promotedfrom one orbital to another. The HOMO-LUMO transitioncorresponds to molecules going from their groundstate to their first excited state. (a) Write out the molecularorbital valence electron configurations for the ground stateand first excited state for N2. (b) Is N2 paramagnetic or diamagneticin its first excited state? (c) The electronic absorptionspectrum of the N2 molecule has the lowest energypeak at 170 nm. To what orbital transition does this correspond?(d) Calculate the energy of the HOMO-LUMO transitionin part (a) in terms of kJ/mol. (e) Is the…9) The vibrational frequency of gaseous HCl occurs at 2885 cm¹ in the IR spectrum. What is the energy E, of this radiation in joules? a) 5.73 x 10-20 J b) 8.24 x 10-19 J c) 6.48 x 10-21 J d) 1.80 x 10-19 J
- Which of the following frequencies corresponds to the highest ener O 9.12 x 1012-1 O 3.20 x 10%s1 O 8.50 x 1020s! O 3.00 x 103 S. O 4.12 x 10 s 1(g) Which of the following compound gives the largest vibrational frequency among H2, D2,HD, and Cl2? A. HD B. D2 C. H2 D. Cl25. Calculate the reduced mass for the two isotopomers (HCl and HCI). Which isotopomer do you expect to have a higher vibrational frequency ? (Recall = 20