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Multiple Choice
Which of the following functional groups contains a nitrogen atom?
A
Amino group
B
Carboxyl group
C
Hydroxyl group
D
Carbonyl group
Verified step by step guidance
1
Identify the functional groups listed in the problem: Amino group, Carboxyl group, Hydroxyl group, and Carbonyl group.
Understand the structure of each functional group: An amino group is characterized by the presence of a nitrogen atom bonded to one or more hydrogen atoms, typically represented as \( \text{NH}_2 \).
Examine the other functional groups: A carboxyl group contains a carbon atom double-bonded to an oxygen atom and single-bonded to a hydroxyl group (\( \text{COOH} \)). A hydroxyl group consists of an oxygen atom bonded to a hydrogen atom (\( \text{OH} \)). A carbonyl group features a carbon atom double-bonded to an oxygen atom (\( \text{C=O} \)).
Compare the structures: Notice that the amino group is the only one that includes a nitrogen atom, while the other groups do not contain nitrogen.
Conclude that the functional group containing a nitrogen atom is the amino group.