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An unknown organic compound has a molecular formula of C4H8O - VCE - SSCE Chemistry - Question 8 - 2020 - Paper 1
Question 8
An unknown organic compound has a molecular formula of C4H8O. The compound is non-cyclic and contains a double bond. The infra-red (IR) spectrum of the molecule is s... show full transcript
Worked Solution & Example Answer:An unknown organic compound has a molecular formula of C4H8O - VCE - SSCE Chemistry - Question 8 - 2020 - Paper 1
Step 1
What does the region 3100–4000 cm⁻¹ indicate about the bonds in C₄H₈O?
Answer
The region 3100–4000 cm⁻¹ in the IR spectrum typically indicates the presence of N-H or O-H stretching vibrations. However, in this case, there is no peak in the O-H stretch region (3200–3600 cm⁻¹) based on the provided spectrum.
Therefore, since no O-H bond is present in the compound, we conclude that the bonds in C₄H₈O are primarily C-H stretches. This suggests that the molecule does not contain alcohol functionalities and is consistent with the presence of a double bond in the structure.