Match the compound that best fits the following sets of IR bands (in cm -1 ). Pl

Question

Match the compound that best fits the following sets of IR bands (in cm-1). Please note that each set corresponds to just a few important bands for each compound. Mark the appropriate letter from the sets in the space provided next to each compound. Note: s = strong; m = medium; w = weak; b = broad. (05 pts)

a. Benzoic acid, PhCOOH                               _____

b. Benzonitrile, PhCN                                     _____

c. Biphenyl, Ph-Ph                                          _____

d. 1, 4-Dioxane _____

e. Isobutylamine, (CH3)2CHCH2NH2             _____

a. 3080 (w), nothing 3000-2800, 2230 (s), 1450 (s), 760 (s), 688 (s).

b. 3380 (m), 3300 (m), nothing 3200-3000, 2980 (s), 2870 (m), 1610 (m).

c. 2955 (s), 2850 (s), 1120 (s).

d. 3030 (m), 730 (s), 690 (s).

e. 3200-2400 (b, s), 1685 (b, s), 705 (s).

Explanation / Answer

a. Benzoic acid, PhCOOH e. 3200-2400 (b, s), 1685 (b, s), 705 (s).

b. Benzonitrile, PhCN                    a. 3080 (w), nothing 3000-2800, 2230 (s), 1450 (s), 760 (s), 688 (s).     

c. Biphenyl, Ph-Ph                       d. 3030 (m), 730 (s), 690 (s).      

d. 1, 4-Dioxane 2955 (s), 2850 (s), 1120 (s).

e. Isobutylamine, (CH3)2CHCH2NH2        b 3380 (m), 3300 (m), nothing 3200-3000, 2980 (s), 2870 (m), 1610 (m).        

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