QUESTION 5 The IR, 'H NMR and 1°C NMR spectra of compound P are shown below. The molecular formula for compound P is CsH;NO2. Identify three (3) important absorption peaks on the IR spectrum and indicate the bond and wavenumber associated with each peak. Elucidate the structure of compound P and assign each peak in the 'H and 1°C NMR spectra. (Hint. The compound consists of more than one functional group). а. b. MICRONS 13 14 15 16 DO 50 40 30 1747 10 800 600 400 4000 3600 3200 2800 2400 2000 1800 1000 1400 WAVENUMBERS (CM-) 1600 1200 % TRANSMITTANCE

1.  1H-NMR spectrum of 1,3-propanediol (HO-CH2-CH2-CH2-OH) shows a quintet at 1.81 ppm, a singlet at 2.75 pm, and a triplet at 3.83 ppm. Assign each signal to the protons it corresponds to in the molecule. Explain the splitting pattern observed for each signal.

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Which of the following compounds (methylene blue, methyl orange, methyl red, or carotene) does the spectrum belong to?

1. How many proton signals would you expect to see in the ¹H-NMR spectrum of the following molecule? For each of the proton signals, predict the splitting pattern, assuming that you can see only 3-bond splitting.

Determine the compound (name or structure) from the data. Explain features from each data.  Molecular formula: C6H5Br Use molecular formula to determine IHD IR: Identify the presence/absence of five key functional groups NMR: Analyze this last. Consider multiplicity and peak area to confirm compound. The 5 H peak area covers both peaks (at 7.1 and 7.5 ppm Structure?

Which of these choices best describes the interpretation of the following peak that may be recorded in a 'H NMR spectrum? 2.5 8 (2H, d). The underlined hydrogen atom is intended to be the one producing the peak that we are interpreting. O=C-CH,CO2H O=C-CH2CHX2 O=C-CH2CH2X O=C-CH2CH3 None of these interpretations describes this peak.