0 0 0 B IR Problems(1)ppt (page 5 of 10) DQ Que EDGE a VIR Problems(1).ppt 5. Wh

Question

0 0 0 B IR Problems(1)ppt (page 5 of 10) DQ Que EDGE a VIR Problems(1).ppt 5. Which group(s) are indicated by the peaks(s ) in the stretching region of the following infrared spectra . a. Fig. 5-a b. Fig. 5-b C. Fig. c 5-c dd. Fig. 5-d e. Fig 5-e f. Fig. 5-f Wavelength, Pm 910 LITTTIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIITVIIIIIIIII IIIIIIIIIIIIIIIIIII 2000 1800 1600 14001200 1000 Frequency cm Fig 5 a 800 800 Wavelength, a 10 12 EMPHIIIIIIIIIIII IT IIIIIIIIIITMIT III MINITY TOTTI CO IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII 3000 2500 2000 1800 1600 1400 1200 Frequency rew - Fig 5b 1000 800 600

Explanation / Answer

Fig: 5-a:  

                    O-H (stretch) in acid          3300

                    C=O (stretch) in acid        1600

Fig: 5-b:  

                      Carbonyl C=O stretch in aldehydes 1700

                      Alkyl C-H Stretch                                     2700-2800

Fig: 5-C:  

                      O-H (stretch) in alcohols                3300

                      C-H Stretch 2850

Fig: 5-d:  

                      Carbonyl C=O stretch in ester               3300

                      Alkyl C-H Stretch 2950

Fig: 5-e:  

                      N-H stretch of amine                              3400

                      Aromatic C-H Stretch 2950

Fig: 5-f:  

                      O-H stretch hydroxy acid 2900

                      Carbonyl C=O stretch in hydroxy acid 1750

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