Characteristic IR Absorptions of Some Functional Groups Functional Group Absorpt
ID: 1047154 • Letter: C
Question
Characteristic IR Absorptions of Some Functional Groups Functional Group Absorption (cmIntensity Functional Group Absorption ( Intensity C-H 2850-2960 -C-H ?-? Alkyl halide C CL C-Br 3020-3100 1640-1680 3300 2100-2260 -?-H 600-800 500-600 Alcohol O-H C-O 3400-3650 Strong, boad N-H 3300-3500 1050-1150 C-N Carboxvlic acid O-H 1030-1230 C-H C-C Carbonyl compound 3030 2500-3100 Strong, broad Weak 1660-2000 1450-1600 Nitrile 1670-1780 2210-2260 1540 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 coma. Example. "A1600-1850) Compound (A or B) IR frequency or range of frequencies:Explanation / Answer
A is a ketone, has C=O functionality
B is an ether has C-O linkage
The IR region to distinguish between A and B
1670-1780