Can someone please help with this? ASAP please
Ethyl acetate and 2-butene-1,4-diol both have the molecularformula C4H8O2. How would you useinfrared spectroscopy to distinguish between the two?
You need to identify two (2) absorption bands and theircorresponding functional groups for each compound.
Answers can identify a functional groups that exists orthe lack of functional group to justify your answer.
Can Someone Please Help With This Asap Please Ethyl Acetate And 2 Butene 1 4 Diol Both Have The Molecular Formula C4h8 1 (105.57 KiB) Viewed 11 times
Characteristic IR Absorption Ranges (Bands) of Some Functional Groups Frequencies are given in wavenumbers (cm) Remember to consider: Alkanes, alkyl groups: 2850 Alkenes: Alkynes: Alkyl halides: Alcohols: Phenols: Aromatic (benzene): Amines Ethers Carbonyls (general) Aldehydes: Esters: Carboxylic acids 1) Frequency 2) Intensity (strong, medium, weak) 3) Broad vs. sharp 1460-1465 = CH₂ group bending 1365-1380 CH3 group bending Amides 2960 = C-H stretching several moderately strong bands 30203100 C-H next to C=C weak to medium bands 3300 (sharp) C-H next to C-C 1640-1680 = C-C stretching (sharp band) 2100 2260 C=C stretching 600-800 C-CI 3300 - 3650-0-H stretching, usually very strong, broad and symmetrical 1050-1150 = C-O stretching, strong but not as broad 500-600 C-Br 3200 3300 O-H stretching, strong and broad 1200-1300 C-O stretching 3000-3100 = aromatic CH stretching weak to medium bands 1700-2000 = "sawtooth" region bunch of weak bands These are in addition to the aromatic ring bands! 1500, 1600 (sharp) = C=C stretches 700-850 = substitution pattern bands mono: 700 and 760 (two bands) ortho: 735-770 (one band) meta: 700 and 780 (two bands) para: 800-850 (one band) Specific groups with carbonyls: Remember these will appear 30 cm¹ or so LOWER if next to a benzene ring + Ketones: 1700-1720 C=O stretch 1700-1720 = C=O stretch PLUS C-H stretch(es) in 2600-2800 region! 1725-1760 C-O stretch (usually 1740 if no C=C bonds around) PLUS two C-O stretches; one at 1200-1250, the other at 1050-1150 3300-3500N-H stretch (medium, broad, only seen in 1° or 2° amines) 1° amines have 2 peaks 1030-1330 C-N stretch (remember, this is the fingerprint region so if you don't see other evidence for an amine, a peak here may be something else 1050-1150 C-O stretch if its nonaromatic (medium to strong, a bit broad) 1200-1300 = C-O stretch if it's aromatic or C=C adjacent (medium to strong, a bit broad) 1650-1800 = C-O stretch (very strong, a bit broad) 1700-1770 = C=O stretch PLUS really broad, bumpy O-H at 2500-3100 and C-O at 1200-1250 1640-1700C-O stretch PLUS there could be N-H around 3300-3500
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