Characteristic IR Absorptions of Some Functional Groups Functional Group Absorpt

Question

Characteristic IR Absorptions of Some Functional Groups Functional Group Absorption (cm1)IntensityFunctional Group Absorption ) Intensity Alkane C-H -C-H C-C Alkyl halide C-C C-Br Amine 2850-2960 Medium 3020-3100 Medium 1640-1680 Medium Alkyne 600-800 Strong Strong 3300 Strong 2100-2260 Medium Alcohol O-H C-O Arene C-H C-C Carbonyl compound Strong, broad N-H Strong 3400-3650 3300-3500 Medium 1050-1150 C-N Carboxylic acid O-H 1030-1230 Medium 3030 Weak 2500-3100 Strong, broad 1660-2000 1450-1600 Weak Medium Nitrile 1670-1780 Strong C-N 2210-2260 Nitro NO 1540 Strong 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") OCH Compound (A or B). IR frequency or range of frequencies: cm

Explanation / Answer

Compound A have a ketonic group so it will show carbonyl frequency

So A, 1670-1780.

And compound B have a ether group.

So B , 1050-1150.

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