10 minutes maximum An IB Periodic Table is required. |
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1. What is the IHD (index of hydrogen deficiency) of a molecule with the molecular formula C8H11NO3?
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2. Which structural information can be obtained from an infrared spectrum?
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3. The infrared spectrum of a compound shows major absorbances at 3350 cm-1 and 2900 cm-1 only above 1500 cm-1. Which one of the following compounds is the most likely to produce such a spectrum?
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4. The infrared spectrum of a compound is shown below. Which structure is unlikely to be the compound? |
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5. How many different hydrogen environments are there in this molecule? |
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6. What is the relative number of hydrogen atoms in each environment in the molecule 1-methoxypropane CH3O(CH2)2CH3?
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7. The following four molecules all share the same molecular formula C4H8O2. How many of them will show three major peaks in their 1H NMR spectrum? |
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8. The 1H NMR spectrum of a compound contains 3 peaks with the relative area of 2:1:6, as shown below. |
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Which of the following is the most likely compound?
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Questions 9 and 10 are about the molecule shown here: |
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9. What is the IHD (index of hydrogen deficiency) of this molecule?
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10. Which of the following peaks is not likely to be present in the mass spectrum of the molecule?
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