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- 1. The energy of a photon is. proportional to its wavelength and proportional to its frequency. (directly or indirectly) 2. Which of the following has a lower characteristic stretching frequency, the C O bond or the C-O bond? Explain briefly. C=0 3. Ethyne HCECH does not show IR absorption in the region 2000-2500 em-! because. 4. Which statement best explains why a carbonyl absorbs infrared radiation at a higher frequency than an alkene absorption?Which of the following bonds would have a higher stretching frequency? Explain. 18 CH, H,Which of the tollawing statements regarding IR spectroscopy, is wrong? a. Melecular vibrations are due to periodic metions of atoms in molecules and include bond stretching, torsional shanges, and bond angle shanges. b. intrared spectra give intormation about bonding features and functional groups in melecules С. Jntrared radiation is higher in energy, than UV radiation. d. Jatrared spectra recard the transmission of IR radiation. e.l None of the above
- ational nown b elow. Vibrations of XEC14: Left: Scissoring. Middle: Wagging. Right: Twisting. Which of these motions will be IR active? In other words, which of these motions will lead to the absorption of IR light and be represented by a peak in the IR spectrum of this compound? O A. Only twisting is IR active. O B. Only wagging is IR active O C. Both scissoring and twisting are IR active. D. Both wagging and twisting are IR active. O E. All of these vibrations are IR activeTrue or False 1. A molecule that is "IR inactive" means that it does not produce any signal due to no vibration. 2. Infrared spectroscopic data is reported in wavenumber (cm-1) against absorbance because they have a linear relationship. 3. The signals observed from a molecule of chloropropane will have a higher wavenumber than iodopropane. 4. The signals observed from the C-C bond in an alkene will report at a higher wavenumber than the C-C bond in an alkyne.Infrared spectrum of methanol (CH3OH) exhibits a peak at 3300 cm-¹ and 3000 cm-1 to the O-H and C-H stretching mode, respectively. If all the H atom in CH3OH are replaced by a corresponding deuterium atom, determine the expected position of the O-D and C-D stretching modes (assume that bond strength k values are identical for both O-H and O-D; C-H and C-D). Mention one other characteristic stretching peak you would expect in the IR spectrum of methanol (CH3OH) other than these two peaks? What will be the effect of the replacement of H by D on this peak?
- 10) The following spectra correspond to xylenes (dimethylbenzenes) ortho, meta and para. Which corresponds to which?2) Here is an IR spectrum of one of the molecules below. Which one? Describe what specific features of the IR spectrum allow you to make the assignment. 100 3000 2000 1500 1000 500 Wavenumber, cm1 H3C H3CLCH3 CH3 CH3 CH3 H3C, CH3 H;C. H3C H3C CH3 В CH3 E A D Transmittance, %c) The two molecules below both possess a nitro group; however, one of the two nitro groups has a lower N=O stretching frequency its IR spectrum. Which molecule has the lower stretch (i.e. lower wavenumber value), and why? NO2 NO2 versus
- Q2: Choose the correct answer for each of the following: () 1 - In the infrared spectrum of a Compound containing a triple C-C bond, the amplitude oscillation band appears The Stretch) has at: - A) 2700 cm ¹ b) 2100 cm ¹ -1 c) 3100 cm ¹ 2- Stretching frequency of the O=C bond of a compound (3-butene-2-on) is less than the stretching frequency of a compound (2-propanone) a.) hydrogen bonding c) Vibration duplication b) Electronic effects 3- The compound o-hydroxybenzoic acid can be distinguished from the compound m-hydroxybenzoic Acid by infrared spectroscopy based on: a) OH. Group b) group curve oscillation) C-H c) group amplitude oscillation C=OExplain why these are the correct spectra for the molecules. Identify a specific absorption band which identifies each characteristic functional group of the molecule chosen.4) Compare the IR spectra of both isomers and show the bond vibrations for functional groups, decide which one is nitro or nitrito isomer. bom 72.00- 64.00- 56.00- 48.00- 40.00- 32.00- 24.00- 16.00- 8.00- 4000 3600 3200 2800 2400 2000 1600 1200 800 72.00- 64.00- 56.00- 48.00- 40 00- 32.00 - 24.00- 16.00- 8.00- 4000 3600 3200 2800 2400 2000 1600 1200 800