Question

which groups are here?

Absorbance 0.2 4000 3500 3000 2965 943018.65 2922.55 2872.49 2731.91 2500 Wavenumbers (cm-1) 2000 1592.12 1606.53 1614.10 1465 65 1495.92 1516.63 1500 1453.47 1376.89 1038,88 1052.53 1000 769.32 691,53 697.74 4743.52

Answer 1

3018 cm-1, medium, sp2 alkene =C-H stretch

2850-3000 cm-1, strong, sp3 alkane C-h stretch

1614 cm-1, medium, sp2 alkene C=C stretch

1377 to 1465 cm-1, medium sp3 alkane C-H bending

691 to 769 cm-1, strong, sp2 alkene =C-H bending

Conclusion: The given IR spectrum represent an alkene consisting alkyl groups also. Most probably it could be 1-pentene.

The standard spectrum of 1-pentene in Transmittance mode is shown below for your kind consideration here

DET 4000 2000 T u 1500 soo 1000 500 3080 33 1643 22 1231 84 29654 1465 39 | 1058 84 2932 6 1441 47 1046 79 2876 14 1417 64 1993 33 2945 42 | 1380 55 1912 13 2736 86 1339 77 180 64 1826 74 1268 81 854 01 768 81 759 84 745 81 628 66 556 86 CH3—(CH2 – CH=CH2

Hope this helped you!

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