Question

Propose likely assignments for all peaks shown. Note that carbon chemical shifts often follow trends similar to proton chemical shifts.

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(d) (c) (b) (a) H3C CH CH CH COO CH3 NH (e) Drag the appropriate labels to their respective targets. Note: not all labels will be used. Hb and He Hd and He Ha and He 3.0 3.5 2.5 2.0 1.5 1.0 40 50 One ?help reset

Answer 1

(d cb (a) Hi and He 30 NH3 Hc 40 O CO 3.5 3.0 2.5 2.0 1.5 1.0 Hd and Hc are equivalent protons and have less value Ha attached to COO- and NH3 hence more 8 value Same trend follows for 13C-NMR spectrum