Write the IR frequency or range of frequencies that would best distinguish betwe
ID: 985315 • Letter: W
Question
Write the IR frequency or range of frequencies that would best distinguish between the two compounds shown. Specify which compound (A or B) will display a band at this frequency in its IR spectrum.
(Choose the most prominent frequency. Do not include units in your answer. Use only the frequencies listed in the table given above. Write the letter of the compound, followed by the range of frequencies, separated by a comma. Example. "A,1600-1850")
Compound (A or B), IR frequency or range of frequencies: ___________ cm-1
Characteristic IR Absorptions of Some Functional Groups Functional Group Absorption (cm-1) Intensity Functional Group Absorption (cm-1) Intensity Alkane Alkene C-H 2850-2960 Medium =C-H 3020-3100 Medium C=C 1640-1680 Medium Alkyne Alkyl halide C-H 3300 Strong C-Cl 600-800 Strong CC 2100-2260 Medium C-Br 500-600 Strong Alcohol Amine O-H 3400-3650 Strong, broad N-H 3300-3500 Medium C-O 1050-1150 Strong C-N 1030-1230 Medium Arene Carboxylic acid C-H 3030 Weak O-H 2500-3100 Strong, broad C=C 1660-20001450-1600 Weak
Medium Carbonyl compound Nitrile C=O 1670-1780 Strong CN 2210-2260 Medium Nitro NO2 1540 Strong
Explanation / Answer
Compound B will specify frequency or range of frequencies : 3400-3650 (strong and broad) and 1050-1150 (strong)
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