NCEA Chem 3.2 Spectroscopy

¹³C NMR Spectra

• spectra that gives information about carbon environmetns
• spectra that gives information about the bonds in the compound
• spectra that gives information about the mass of fragments of the compound

IR Spectra

• spectra that gives information about the bonds in the compound
• spectra that gives information about the mass of fragments of the compound
• spectra that gives information about carbon environmetns

Mass Spectra

• spectra that gives information about the mass of fragments of the compound
• spectra that gives information about the bonds in the compound
• spectra that gives information about carbon environmetns

NMR Spectra: three peaks

• Report: The compound has three carbon environments and at least three carbon atoms.
• Report: The compound has five carbon environments and at least five carbon atoms.
• Report: This shift indicates a carbon in a carbonyl compound but cannot narrow down the functional group more.

NMR Spectra: five peaks

• Report: The compound has five carbon environments and at least five carbon atoms.
• Report: The compound has three carbon environments and at least three carbon atoms.
• Report: This shift indicates a carbon in a carbonyl compound and can only be in an aldehyde or a ketone.

NMR: The compound has five carbon environments and _______ three carbon atoms.

• Missing Word: "at least"
• Missing Word: "about"
• Missing Word: "exactly"

NMR Spectra: one shift is at 180ppm

• Report: This shift indicates a carbon in a carbonyl compound but cannot narrow down the functional group more.
• Report: This shift indicates a carbon in a carbonyl compound and can only be in an aldehyde or a ketone.
• Report: This shift indicates a carbon attached to a carbonyl compound but cannot narrow down the functional group more.

NMR Spectra: one shift is at 220 ppm

• Report: This shift indicates a carbon in a carbonyl compound and can only be in an aldehyde or a ketone.
• Report: This shift indicates a carbon in a carbonyl compound but cannot narrow down the functional group more.
• Report: This shift indicates a carbon attached to a carbonyl compound but cannot narrow down the functional group more.

NMR Spectra: one shift is at 120ppm and this is the only shift between 100 and 150.

• Report: This shift indicates a carbon in a C=C bond and so must be a symmetrical compound as two carbons are in the same environment.
• Report: These two shifts indicate an asymmetrical C=C bond as the two carbons are in different environments.
• Report: This shift indicates a carbon in a -CH₂- or C-N or C-Cl or C-Br or C-C=O environment.

NMR Spectra: two shifts between 100 and 150ppm

• Report: These two shifts indicate an asymmetrical C=C bond as the two carbons are in different environments.
• Report: This shift indicates a carbon in a C=C bond and so must be a symmetrical compound as two carbons are in the same environment.
• Report: This shift indicates a carbon in a -CH₂- or C-N or C-Cl or C-Br or C-C=O environment.