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- The IR spectrum of 2-methyl-1-butanol (H;CCH,CH(CH;) CH,OH) and tert-butyl methyl ether [(CH;);COCH3] are shown below. Assign cach spectrum to the correct com- pound and identify the frequencies and the functional groups used to support your assignment. λ (μm) 6 7 8 9 10 11 12 1314 15 2.5 100 3 5 90 80 70 60 50 40 30 20 10 4000 3600 3200 2800 2400 2000 1800 1600 1400 1200 1000 800 600 400 Frequency (cm-1) A (µm) 7 8 9 10 11 12 13 14 15 2.5 100 3 5 20 4 6 90 80 70 60 50 40 30 20 10 4000 3600 3200 2800 2400 2000 1800 1600 1400 1200 1000 800 600 400 Frequency (cm¬!) (%) Transmission (%) Transmission 20ve Transmittance 0.6 3000 Anthracene INFRARED SPECTRUM P Wavenumber (cm-1) 1000 NIST Chemistry WebBook (https://webbook.nist.gov/chemistry) 1- For the above shown IR-Spectrum (Indicate the structure of the organic molecule). What are the characteristic peaks present? 2- Show (or draw) the IR spectrum, The NMR Spectrum and the Mass spectrum for Methyl ethyl ester. 3- Show or hand draw the IR spectrum, The NMR Spectrum and the Mass spectrum for Acetyl Salicylic acid (commonly known as Aspirin) X1. You received the following absorbance sketch from your lab partner, and he/she asks you for help in identifying the absorbance maximum. What is the estimated Amax in the spectrum for Standard No. 5 Blue #1 solution (see Figure 1)? 2.00- 1.95 1.50- 1.25 1.00 75 .50 .25 300 300 400 450 500 550 600 650 700 Wavekngth Cnm) Figure 1: Absorbance vs. Wavelength of Blue #1 2. What color is associated with this Amax? Explain why this color association makes sense for this dye solution. Assume your lab partner described that the solution looked blue. Absorbame o CAu)
- Q1 (a) Explain how the peaks in Infra-Red spectroscopy are generated and what information the peaks can provide about the molecule analysed.(250 words limit) 25% (b) Explain how interaction of Ultra-Violet / Visible light with a molecule produces an absorbance and hence a peak, indicating what parts of a molecule can absorb this radiation. (250 words limit) (25%)Spectroscopic Analysis https://www.youtube.com/watch?v=ZfMPyZiDsf4&list=PLE-217H0ao60Uzpzj-FNP_0ScVp5SZB7j&index=2 watch the following question and read the article to answer the questions Spectroscopic Analysis-1 a.Which of the following statements regarding IR spectroscopy is wrong? Infrared radiation is higher in energy than UV radiation. Infrared spectra record the transmission of IR radiation. Molecular vibrations are due to periodic motions of atoms in molecules, and include bond stretching, torsional changes, and bond angle changes. Infrared spectra give information about bonding features and functional groups in molecules. b.Which is the correct order of decreasing wave number of the stretching vibrations of (1) C-H (alkane), (2) C-H (alkene), (3) C-H (alkyne), and (4) C=O? (1) > (2) >(3) >(4) (4) < (3) < (2) < (1) (3) < (4) ≈ (2) < (1) (1) < (4)…Which of the structures shown below the IR spectrum matches the IR spectrum below. TRANSMITTANCE 0.8 0.4 2000 Wavenumber (cm-1) NIST Chemistry WebBook (http://webbook.nist.gov/chemistry) 3000 B 1000 impice E
- [X] (ppm) 0.00 10.0 15.0 20.0 25.0 30.0 35.0 x-axis Resources UV-Vis absorbance data for molecule X collected at 425 nm using a 3.50 cm cuvet is given in the table. [X] (M) 0.00 1.00 × 10 4 1.50 × 10-4 2.00 × 10-4 2.50 × 10-4 3.00 x 10-4 3.50 x 10-4 O %T %T T A 100.0 1.000 0.000 49.4 0.494 0.306 34.9 0.349 0.457 25.3 0.253 0.597 17.3 0.173 0.761 15.4 0.154 0.813 13.9 0.139 0.857 Prepare a plot using the linear range of the data to determine the molar absorptivity. What should be plotted on each axis to determine the molar absorptivity of molecule X at this wavelength? x Give Up? y-axis Hint OT 8:11. Identify the correct structure for the given IR spectrum. 100 50 1000 500 4000 3000 2000 1500 Wavenumber (cm-) C Transmittance (%)Molecular Formula: C10H14 8 LOD TRANSMITTANCE1% D 4000 STRUCTURE: mult. t 2.72 q 6.90 S d t ppm 1.18 7.11 7.53 3000 H 6 4 1 2 1 5 2000 SPECTRUM 5 4 PPM HAVENUMBERI-L 1500 3 1000 500
- 3. If you wished to study the molecule below by measuring absorbance, what wavelength should you set your spectrophotometer to? 1.6 Absorbance 1.4 1.2 1.0 0.8 0.6 0.4- 0.2- ME 0.0 300 400 600 Wavelength (nm) 500 Solutions and Mol....pdf 2 700 20221027_141317.jpg 800For problems Use the provided data to identify functional groups the molecule contains and you are not expected to come up with an exact structure. propose some possible structures that fit the data 1a. Hydrocarbon with MW 84. (a) A volatile liquid hydrocarbon. The molecular weight determined by mass spectrome-- try is 84. 4000 3500 3000 2500 2000 1500 1000 Wavenumber (cm-1) TransmissionThe IR spectrum below belongs to an organic compound A having one nitrogen atom. Determine which structures that fits to the IR spectrum. Justify your answer by providing two (2) IR absorption peaks with their wavenumber. CN NH2 Ahsorbance / 4 50 100- 4000 3000 2500 2000 1500 1000 500 Wavenumbers / cm