In the box provided, write the IR frequency or range of frequencies that would b

Question

In the box provided, 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")

Characteristic IR Absorptions of Some Functional Groups Functional Group Absorption (cm) IntensityFunctional Group Absorption (cm-) Intensity Alkane C-H Alkene -C-H C-C Alkyl halide C-Cl C-Br Amine 2850-2960 Medium 3020-3100 Medium 1640-1680 Medium Alkyne 3300 Strong 600-800 Strong 2100-2260 Medium 500-600 Strong Alcohol O-H C-O Arene C-H C-C 3400-3650 Strong, broad N-H 3300-3500 Medium 1050-1150 C-N Carboxylic acid O-H Strong 1030-1230 Medium 3030 Weak 2500-3100 Strong, broad 1660-2000 1450-1600 Weak Medium Carbonvl compound C-O Nitro NO2 Nitrile 1670-1780 Strong 2210-2260 Medium 1540 Strong

Explanation / Answer

The compound A is an alcohol. It will give peaks characteristic to -OH group.
Hence, the answer is A, 3400-3650
Note: Compound B is an alkene. It will give peak characteristic to C=C double bond.
1640-1680

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