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Problem: Given the structure below, which IR absorption band is inconsistent with the structure? a) 2900 cm-1b) 1600 cm-1 c) 1200 cm-1 d) 1740 cm-1

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Given: propyl ethanoate → ester

Characteristic IR spectrum values:

  • Alkane C-H stretch → 2990 – 2850 cm-1
  • Esters 
    • C=O stretch
      • 1765 – 1735 cm-1 (sat.)
      • 1730 – 1715 cm-1(conj.)
    • C-O stretch → 1163-1210 cm-1
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Problem Details

Given the structure below, which IR absorption band is inconsistent with the structure? 

a) 2900 cm-1

b) 1600 cm-1 

c) 1200 cm-1 

d) 1740 cm-1

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