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MCAT-NMR-H1
Question | Answer |
---|---|
RCH3 | 0.9 ppm |
RCH2 | 1.25 ppm |
R3CH | 1.5 ppm |
-CH=CH | 4.6 - 6 ppm |
-C(trip. bond)CH | 2 - 3 ppm |
Ar-H (H on aromatic ring: popular) | 6 - 8.5 ppm |
-CHX | 2 - 4.5 ppm |
-CHOH/ -CHOR | 3.4 - 4 ppm |
RCHO (aldehyde: popular) | 9 - 10 ppm |
RCHCO- | 2 - 2.5 ppm |
-CHCOOH/-CHCOOR | 2 - 2.6 ppm |
-CHOH-CH2OH | 1 - 5.5 ppm |
ArOH | 4 - 12 ppm |
-COOH (carboxylic acid: popular) | 10.5 - 12 ppm |
-NH2 | 1 - 5 ppm |
TMS (tetramethylsilane) | 0.0 ppm |
deshielding | downfield (to the left)... (higher ppm) |
To determine # of peaks present: | n + 1 rule (n = # of protons 3 bonds away from proton of interest) |
doublet area ratio? | 1:1 |
triplet area ratio? | 1:2:1 |
4 peaks, area ratio? | 1:3:3:1 |