QuestionMay 1, 2025

Propose structures for compounds that meet the following descriptions: (a) C_(5)H_(8) with IR absorptions at 3300 and 2150cm^-1

Propose structures for compounds that meet the following descriptions: (a) C_(5)H_(8) with IR absorptions at 3300 and 2150cm^-1
Propose structures for compounds that meet the following descriptions: (a) C_(5)H_(8) with IR absorptions at 3300 and 2150cm^-1

Solution
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Answer

Pent-1-yne (CH≡C-CH_2-CH_2-CH_3) Explanation 1. Analyze the molecular formula and IR data C_5H_8 indicates a degree of unsaturation (double bonds, triple bonds, or rings). The IR absorptions at 3300 cm^{-1} suggest an \text{-C≡CH} group (terminal alkyne), and 2150 cm^{-1} indicates a \text{C≡C} triple bond. 2. Propose a structure A compound with one terminal alkyne group fits the description. One possible structure is **pent-1-yne** (CH≡C-CH_2-CH_2-CH_3).

Explanation

1. Analyze the molecular formula and IR data<br /> $C_5H_8$ indicates a degree of unsaturation (double bonds, triple bonds, or rings). The IR absorptions at 3300 cm$^{-1}$ suggest an $\text{-C≡CH}$ group (terminal alkyne), and 2150 cm$^{-1}$ indicates a $\text{C≡C}$ triple bond.<br /><br />2. Propose a structure<br /> A compound with one terminal alkyne group fits the description. One possible structure is **pent-1-yne** ($CH≡C-CH_2-CH_2-CH_3$).
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