Analytical, Structural Determination, and Organic Synthesis Strategy
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A-Level Chemistry Q & A Practice
1 of 5 free exam-style exercises in this topic
An unknown C₄H₈O₂ has these spectra. Which structure fits?
evidence
observation
IR
strong C=O; no broad O−H
¹H NMR
triplet 1.2 (3H), quartet 4.1 (2H), singlet 2.0 (3H)
quartet, 2H
singlet, 3H
triplet, 3H
4.1
2.0
1.2
chemical shift, δ / ppm (decreases left to right)
Select one option.
A
butanoic acid
B
ethyl ethanoate
C
butan-2-one
D
methyl propanoate
E
butane-1,4-diol
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