Question: Propose structures for carboxylic acids that show the following peaks in their 13 C NMR spectra. Assume that the kinds of carbons (1, 2, 3,

Propose structures for carboxylic acids that show the following peaks in their ¹³C NMR spectra. Assume that the kinds of carbons (1°, 2°, 3°, or 4°) have been assigned by DEPT-NMR.

(a) C₇H₁₂O₂: 25.5 δ (2°), 25.9 δ (2°), 29.0 δ (2°), 43.1 δ (3°), 183.0 δ (4°)

(b) C₈H₈HO₂: 21.4 δ (1°), 128.3 δ (4°), 129.0 δ (3°), 129.7 δ (3°), 143.1 δ (4°), 168.2 δ (4°)

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