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Table 21.1 gives the order of precedence for six functional groups. (...) In the IUPAC system, a carboxyl group takes precedence over most other functional groups (table 21.1), including hydroxyl and amino groups, as well as the carbonyl groups of aldehydes and ketones.
"Chemistry" 2e - Blackman, A., Bottle, S., Schmid, S., Mocerino, M., Wille, U.
The signal of the carboxyl hydrogen of 2-methylpropanoic acid, labelled 'c' on the ¹H-NMR spectrum in the figure 20.47, has been offset by δ 2.4.
"Chemistry" 2e - Blackman, A., Bottle, S., Schmid, S., Mocerino, M., Wille, U.

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The signal of the carboxyl hydrogen of 2-methylpropanoic acid, labelled 'c' on the ¹H-NMR spectrum in the figure 20.47, has been offset by δ 2.4.
"Chemistry" 2e - Blackman, A., Bottle, S., Schmid, S., Mocerino, M., Wille, U.
I dreamt of nothing but functional groups last night