noose the frequency of a peak that is most likely to correspond to an N-H stretch in an IR spectrum. A) 3450 cm C) 2950 cm D) 2250 cm E) 1750 cm
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- Choose the frequency of a peak that is most likely to correspond to an sp³ C-H stretch in an IR spectrum. A) 3450 cm-¹ B) 3100 cm-¹ C) 2950 cm-¹ D) 2250 cm-1¹ E) 1450 cm-¹Question 7 of 21 Choose the frequency of a peak that is most likely to correspond to an N-H stretch in an IR spectrum. A) 3450 cm-1 B) 3050 cm-1 C) 2950 cm-1 D) 2250 cm-1 E) 1750 cm-1Choose the frequency of a peak that is most likely to correspond to a C=C stretch in an IR spectrum. A) 3450 cm-1 B) 3100 cm-1 C) 1720 cm-1 D) 1600 cm-1 E) 1150 cm-1
- Question 3 of 21 Choose the frequency of a peak that is most likely to correspond to a C-O stretch in an IR spectrum. A) 3450 cm-1 B) 3100 cm-1 C) 1720 cm-1 D) 1600 cm-1 E) 1150 cm-1Choose the frequency of a peak that is most likely to correspond to an sp C-H stretch. A) 3450 cm-¹ 1 B) 3300 cm-¹ C) 3100 cm-¹ D) 2800 cm-¹ E) 2200 cm-¹he number of signals expected to be observed for CD2Cl2 solvent in CNMR is (I for D is 1) a) 1 b) 2 c) 3 Q2: Which of the following isotopes do not have quadrupole momet b) 27AI (I = 5/2) d) 5 e) 7 a) "Li (I = 3/2) %3D c) 170 (I = 5/2) d) 19F (I= 1/2) 23: Which of the following isotopes is expected to be NMR inactive? 12C b) 170 c) 31p d) 1°F e) 29Si : Consider the compound Fe3(CO)12, calculate %C (Fe 55.85 g/mol, C 12.1 gme c) 29.7 % e) 34.2 d) 28.6 % 30.7 % b) 6.13 %
- 7) How many scans are needed to improve the signal to noise ratio (S/N) of a spectrum by a factor of 10 ? a) 5 scans b) 10 scan c) 20 scans d) 50 scans e) 100 scansA)What absorbance value corresponds to 80% transmittance? B)What is the new % transmittance value if the absorbance value in A increases by 0.250?Isoamyl acetate is the primary component of artificial banana flavor. Which signals will be in the positive phase, negative phase, or nonexistent in normal 13C NMR, DEPT-90, and DEPT-135 of isoamyl acetate?
- 2. the base peak in MS spectroscopy always indicates the molecular weight of the samplea) false b) trueBigger size sample would result to better quality spectra compared to smaller sample with small size in ATR-FITR. True FalseA carbon signal measured in a 300MHz spectrometer with an observing frequency of 75.47MHz isfound to have a chemical shift of 187.23 ppm. What is the resonance frequency of the carbon withthis chemical shift?A) 56169 HzB) 75 484 130 HzC) 14 130 HzD) 300 056 139 Hz