| 21. | The 1600 is due to vibration of a C = C double bond.
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| 22. | Isotoluenes are a prominent class of compounds with exocyclic double bonds.
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| 23. | The activity was unaffected by saturation of the C9-C10 double bond.
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| 24. | Double bonds involving carbon are stronger than single bonds and are also shorter.
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| 25. | :: Fully hydrogenated means the elimination of all double bonds.
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| 26. | The color intensifies with increasing number of double bonds in the molecule being stained.
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| 27. | Some oils and fats have multiple double bonds and are therefore called polyunsaturated fats.
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| 28. | A double bond is of course a type of bond.
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| 29. | This reagent will convert aldehydes to carboxylic acids without attacking carbon carbon double bonds.
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| 30. | The double bonds in fullerene are not all the same.
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