For each of the following pairs of compounds, name one absorption band that can be used to distinguish between them.
c.
d.

검증된 단계별 안내

Step 1: Analyze the first pair of compounds (I). The first compound is cyclopentane, a saturated cyclic hydrocarbon, while the second compound is methylcyclopentane, which has a methyl group attached to the cyclopentane ring.

Step 2: Identify the functional groups or structural differences in the first pair. Cyclopentane lacks any substituents, while methylcyclopentane has a methyl group (-CH₃). This difference can be detected using IR spectroscopy by looking for the C-H stretching vibrations of the methyl group.

Step 3: In IR spectroscopy, the methyl group in methylcyclopentane will show absorption bands around 1375 cm⁻¹ and 1450 cm⁻¹ due to C-H bending vibrations, which are absent in cyclopentane.

Step 4: Analyze the second pair of compounds (II). Both compounds are alkynes, but the first compound is a terminal alkyne (with a hydrogen attached to the triple bond), while the second compound is an internal alkyne (with no hydrogen attached to the triple bond).

Step 5: In IR spectroscopy, terminal alkynes exhibit a sharp absorption band around 3300 cm⁻¹ due to the C-H stretching vibration of the terminal alkyne hydrogen. This band is absent in internal alkynes, which can be used to distinguish between the two compounds.

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이 영상 해법은 위 문제에 도움이 된다고 튜터들이 추천한 것입니다.

영상 길이:

주요 개념

질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.

Infrared (IR) Spectroscopy

IR spectroscopy is a technique used to identify functional groups in organic compounds by measuring the absorption of infrared light. Different bonds absorb characteristic frequencies of IR radiation, leading to distinct absorption bands in the spectrum. This method is crucial for distinguishing between compounds based on their molecular vibrations.

Functional Groups

Functional groups are specific groups of atoms within molecules that are responsible for the characteristic chemical reactions of those molecules. In the context of IR spectroscopy, the presence of different functional groups, such as alkenes, alkynes, or cyclic structures, can lead to unique absorption bands that help differentiate between compounds.

Absorption Bands

Absorption bands in an IR spectrum correspond to specific vibrational transitions of molecular bonds. Each type of bond (e.g., C-H, C=C, C≡C) has a unique absorption frequency, allowing chemists to identify and distinguish between compounds. Recognizing these bands is essential for interpreting IR spectra and determining the structure of organic molecules.

For each of the following pairs of compounds, name one absorption band that can be used to distinguish between them. c. d.