Multiple Choice
All of the following are examples of functional groups in biology except:
a) -CH3.
b) -COOH.
c) -H2O.
d) -NH2.
e) -OH.
4. Biomolecules
Functional Groups
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Which of the following molecules has a carboxyl functional group?
A
R—NH2
B
R—COH
C
R—OPO3–2
D
R—COOH
Verified step by step guidance1
Understand the structure of a carboxyl functional group. A carboxyl group is characterized by the presence of a carbon atom double-bonded to an oxygen atom and single-bonded to a hydroxyl group (OH). The general formula is \( \text{R--COOH} \).
Examine the given options to identify the functional groups. The options are \( \text{R--NH}_2 \), \( \text{R--COH} \), and \( \text{R--OPO}_3^{2-} \).
Compare each option to the structure of a carboxyl group. \( \text{R--NH}_2 \) is an amine group, \( \text{R--COH} \) resembles an aldehyde group, and \( \text{R--OPO}_3^{2-} \) is a phosphate group.
Identify the option that matches the carboxyl group structure. The correct structure should have a carbon atom double-bonded to an oxygen and single-bonded to a hydroxyl group.
Conclude that \( \text{R--COOH} \) is the correct representation of a carboxyl functional group, as it matches the required structural characteristics.
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