Textbook Question
When we begin studying functional groups, the designation of substitution will be especially important. Label the following bromoalkanes as 1° , 2°, 3°, or 4° based on the carbon to which the bromine is attached.
(b)
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2. Molecular Representations
Functional Groups
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Which of the following functional groups is characterized by a carbon atom double-bonded to an oxygen atom ()?
A
Amino group
B
Carboxyl group
C
Carbonyl group
D
Hydroxyl group
Verified step by step guidance1
Identify the functional groups listed in the problem: amino group, carboxyl group, carbonyl group, and hydroxyl group.
Understand the structure of each functional group: an amino group contains a nitrogen atom bonded to hydrogen atoms, a carboxyl group contains a carbon atom double-bonded to an oxygen atom and also bonded to a hydroxyl group, a carbonyl group contains a carbon atom double-bonded to an oxygen atom, and a hydroxyl group contains an oxygen atom bonded to a hydrogen atom.
Focus on the carbonyl group, which is characterized by a carbon atom double-bonded to an oxygen atom. This is the defining feature of the carbonyl group.
Compare the structural features of the carbonyl group with the other groups listed to confirm that the carbonyl group is the only one with a carbon-oxygen double bond.
Conclude that the functional group characterized by a carbon atom double-bonded to an oxygen atom is the carbonyl group.
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