| 11. | Propene has a higher density and boiling point than ethylene due to its greater mass.
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| 12. | Propene has low acute toxicity from inhalation.
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| 13. | It is obtained industrially as a byproduct in the production of isopropanol by hydration of propene.
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| 14. | Isobutyraldehyde is manufactured, often as a side-product, by the hydroformylation of propene.
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| 15. | HD-5 is a specification that establishes a maximum concentration of 5 % propene in propane.
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| 16. | Cyclopropane and propene have the same molecular formula but have different structures, making them structural isomers.
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| 17. | Early measurements indicated that at least four gases leaked were methane, propene, ethylene and butane.
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| 18. | The concentration of the propene at the explosion site was abnormally high at 13, 000 ppm.
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| 19. | As a result, propene tends to be the only product, unless local demand exists for hydrogen.
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| 20. | The conversion rate of propene is 98 % and the selectivity to the n-butanal is high.
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