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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- Question 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-1Choose 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-¹
- Question 5 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-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 %Choose 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-¹
- A)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) true
- Bigger size sample would result to better quality spectra compared to smaller sample with small size in ATR-FITR. True False7) 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 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