객관식
An IR spectrum shows a strong, broad absorption around and a sharp absorption near . Which functional group is most likely present?
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2. Molecular Representations
Functional Groups
객관식
Which of the following compounds is a secondary amine?
A
(acetic acid)
B
(ethylamine)
C
(trimethylamine)
D
(dimethylamine)
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검증된 단계별 안내1
Understand the definition of amines based on the number of alkyl or aryl groups attached to the nitrogen atom: a primary amine has one alkyl/aryl group, a secondary amine has two, and a tertiary amine has three.
Analyze each compound's structure to count how many carbon-containing groups are bonded directly to the nitrogen atom.
For acetic acid (CH\_3COOH), recognize that it is a carboxylic acid, not an amine, so it cannot be classified as primary, secondary, or tertiary amine.
For ethylamine (CH\_3CH\_2NH\_2), note that the nitrogen is bonded to only one alkyl group (ethyl), making it a primary amine.
For trimethylamine (CH\_3CH\_3CH\_3N), observe that the nitrogen is bonded to three methyl groups, classifying it as a tertiary amine; therefore, the compound with two alkyl groups attached to nitrogen (dimethylamine) is the secondary amine.
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