Question

Identify the following unkown compound in the IR spec.

The unknown compound can be either ethanol, 1-propanol, 1-propanol, 1-butanol, 2-butanol, isobutanol, 2-pentanol, 3-pentanol, or iso-pentanol.

%Transmittance 40 4000 3000 2984.08 2500 Wavenumbers (cm-1) 2000 1737.04 1500 1446.62 1372.35 1233.97 1097.23 1000 1043.90 937.69 846.48 786.39 633.65 607.18

Answer 1

Hi there my apologies that none of the given compounds list does not matched with given spectrum

1. If alcohol is our compound, the first most basic peak is strong, very broad signal in the region 3200-3600 cm-1, but i do not see such peak.

2. If aldehyde is present then there should be two peaks in the regions 2820-2850 & 2720-2750 cm-1, but they also not present.

But i am confirming that given IR spectrum belongs to ethyl acetate ( C₄H₈O₂ ; M.W: 88.1 g/mol) and also i am gonna attached standard spectrum for your kind consideration below.

2984 cm-1, medium, sp3 C-H stretch

1737 cm-1, strong, ester C=O stretch

1446 & 1372 cm-1, sp3 C-H bending

1233 & 1043 cm-1, strong two bands are symmetric & asymmetric stretch of C-O bond

below 1000 cm-1 are CH₃- deformations

ETHYL ACETATE C4H02 ma u M 11 sp3 C-H stretch TRANSHETTANCET 2 sp3 C-H bend C-O stretch C=O stretch DHT 4000 2060 , LI oporu 1500 2000 SBO HAVENUHBERI-1 2984 62 1993 77 2941 79 379 31 2907 84 1359 66 1 7424 1901 77 1479 79 | 1240 5 1 465 77 1099 77 1 446 74 1048 26 938 81 917 94 847 81 634 79 607 77 CH3-CMO CH2 - CH3

Hope this helped you!

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