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- 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.)13C NMR spectroscopy provides valuable information about the environments of a molecule's carbon atoms. Since carbon atoms are often connected to hydrogen atoms, which could split the carbon signal through spin-spin coupling, the coupling between C and H is often "turned off" through the use of broadband decoupling, causing each C signal to appear as a singlet. Draw an isomer of C5H11Cl that would be expected to have four resonances in its 13C NMR spectra.Which molecules below are rotational Raman active and which are inactive. O3 CH4 NH3 H2 H2O SiH4 CF6 C4H10
- A typical 1"B – 'H bond has a stretching frequency of 2400 cm1. Based on your understanding of isotopic effects on vibrational frequencies, and their connection to bond strength, rank the B - H bonds from weakest to strongest. Consider the most common isotopes of the B- H bonds highlighted below. Make sure to explain your ranking. 10В — 1н, 10В — ?н, 11в — 1Н, 11В - н9. 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.3. State which of the following molecules have (a) rotational absorption spectra, i.e. are rotationally active, (b) vibrational absorption spectra, i.e. are vibrationally active: N2, HF, CS2, SO2, SO, C6H6.
- Q 1(a) Methane, CH4 is a tetrahedral molecule and does not exhibit a permanent dipole moment (i.e. it has a dipole moment of 0). Nonetheless, in microwave spectroscopy methane does exhibit a weak, but measurable absorbance. Explain why you think this is the case? Q 1(b) The diatomic molecule 12C32S has been detected in interstellar gas clouds by microwave spectroscopy. The masses of the two atoms are C = 12.00 amu and S= 31.972 amu and 12C32S has an equilibrium bond length of 1.534 Å. Predict which rotational transition in 12C32S will have the greatest population at a temperature of 85 K.2. Which of the following compounds would you expect to have the highest infrared absorption frequency C-X bond? Bubble in your answer completely. O Br O O OWhich is the correct order of increasing wave number of the stretching vibrations of (1) C-O, (2) 0-H (alcohol), (3) C=N and (4) C=C (alkyne)? *
- 5. In an IR spectrum, the x axis represents wavenumber of the light being absorbed by bond vibrations. The wavenumber is (B) directly proportional to the frequency. (A) directly proportional to the wavelength. (C) inversely proportional to the energy of the wave. (D) None of the above.2. Estimate the energy spacing between adjacent rotational features one would expect for CO, which exhibits a bond length of 1.12 Å and a dipole moment of 0.12 D. (1D = 3.3 x 10- 30 Cm)If a hypothetic vibrational motion of a molecule can be described by Tvib = 2A1 + E, within the point group Cav, how many bands/peaks would you expect to see in its IR spectrum? Explain your reasoning. C (4mm) E 2C, C, 20, 20, h=8 A, 1 1 1 1 x + y', 2 1 1 1 A, B, B, 1-1 -1 R. 1 -1 1 -1 x- y 1 -1 1-1 xy 2 0 -2 0 (x, y) (R, R) (2x, y2) 3.