1). What IR absorption would you use to distinguish between the two compounds ab
ID: 985310 • Letter: 1
Question
1). What IR absorption would you use to distinguish between the two compounds above? cm-1
2). Enter a frequency, or range as lower freq-higher freq, from the table above.
3). Which compound will exhibit this absorption?
Functional Group Absorption (cm-1) Functional Group Absorption (cm-1) Functional Group Absorption (cm-1) Alkane C–H 2850-2960 Alkyl halide C–Cl 600-800 Aldehyde C=O 1730 Alkane C–C 800-1300 Alkyl halide C–Br 500-600 Ketone C=O 1715 Alkene =C–H 3020-3100 Alcohol O–H 3400-3650 Ester C=O 1735 Alkene C=C 1640-1680 Alcohol C–O 1050-1150 Amide C=O 1690 Alkene RCH=CH2 910 and 990 Arene C–H 3030 Carboxylic acid C=O 1710 Alkene R2C=CH2 890 Aromatic ring C=C 1660-20001450-1600 Carboxylic acid O–H 2500-3100 Alkyne C–H 3300 Amine N–H 3300-3500 Nitrile CN 2210-2260 Alkyne CC 2100-2260 Amine C–N 1030-1230 Nitro NO2 1540
Explanation / Answer
The two compounds are having different functional groups so that they can be distinguished best by IR spectroscopy
compound (a) gives a peak at around 1735 cm-1 due to presence of ester functional group, whereas , compoun (b) does not give the same .
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