% Transmittance 50 (a) Compound A 100 What functional groups are responsible for the absorptions above 1500 cm¹ in compounds A and B? при 100 (b) Compound B % Transmittance 50 0 0 4000 3500 3000 2500 2000 1500 1000 500 4000 3500 Wavenumber (cm-1) 3000 2500 2000 1500 1000 Wavenumber (cm¹) 500 a. Compound A has two major absorptions above 1500 cm-1: The absorption at ~3000 cm¹ is due to C-H bonds and the absorption at -1700 cm¹ is due to a C=O group. b. Compound B has two major absorptions above 1500 cm: The absorption at -3000 cm¹ is due to C-H bonds and the absorption at -2250 cm is due to a triple bond, either a C=C or a C=N. Because there is no absorption due to an sp hybridized C-H bond at 3300 cm, this IR spectrum cannot be due to a terminal alkyne (HC=CR) but may still be due to an internal alkyne. 49

Could you please interpret this? I know it is a very weak alcohol, but I’m unsure beyond that.

Name the major IR absorptions and write the name of the unknown compound and its structure.

Interpet and analyze this Infrared (IR) spectra to show the signs from the peaks and what they tell about the unknown compound.

Which of the shown compounds corresponds to the shown IR spectrum ? Micrometers 2.5 100 8 10 12 13 14 15 20 90 80 70 50 40 30 20 10 4000 3600 3200 2800 2400 2000 1800 1600 1400 1200 1000 800 600 400 Wavenumber (cm-!) NH2 Transmittance (%)

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?

Draw the structure of the acid chloride with a molecular formula of C8H7ClO and the following spectroscopic data:

Label 3 peaks and what functional groups and their wavelength they could possibly correlate with in.