 - 1. What common chemical behavior is illustrated by the industrial uses of butadiene?
A) Neutralization B) Hydrolysis C) Combustion D) Polymerization
- 2. Which type of reaction is butadiene's hydrocyanation used to illustrate?
A) 1,2-addition B) Substitution C) Elimination D) 1,4-addition
- 3. What type of complexes are involved in Pd-catalyzed reactions of butadiene?
A) Carbonyl complexes B) Nitrosyl complexes C) Allyl complexes D) Hydride complexes
- 4. What product is formed when butadiene reacts with maleic anhydride in a Diels–Alder reaction?
A) Cyclobutane B) Tetrahydrophthalic anhydride C) Phthalic acid D) Butadiene oxide
- 5. Which metal is used in the butadiene derivative Fe(butadiene)(CO)3?
A) Iron B) Palladium C) Molybdenum D) Nickel
- 6. How is the acute toxicity of butadiene generally classified?
A) High B) Moderate C) Low D) Negligible
- 7. Long-term exposure to butadiene has been associated with which disease?
A) Diabetes B) Arthritis C) Cardiovascular disease D) Glaucoma
- 8. What cancer has a consistent association with butadiene exposure?
A) Bone cancer B) Skin cancer C) Leukemia D) Brain cancer
- 9. How has the IARC designated 1,3-butadiene?
A) Group 1 carcinogen B) Group 2B carcinogen C) Group 3 carcinogen D) Group 2A carcinogen
- 10. What does the ACGIH list 1,3-butadiene as?
A) Suspected carcinogen B) Non-carcinogen C) Confirmed human carcinogen D) Potent mutagen
- 11. Which substance is mentioned as being twice as potent as butadiene in cigarette smoke?
A) Formaldehyde B) Nicotine C) Benzene D) Acrylonitrile
- 12. What is 1,3-butadiene suspected to be in humans, in addition to being a carcinogen?
A) Antioxidant B) Neurotoxin C) Teratogen D) Allergen
- 13. According to animal data, which gender may have a higher sensitivity to the carcinogenic effects of butadiene?
A) Children B) No gender difference C) Women D) Men
- 14. What factor might explain the higher sensitivity of women to butadiene's carcinogenic effects?
A) Metabolic rate differences B) Body mass index C) Estrogen receptor impacts D) Differences in lung capacity
- 15. Why is 1,3-butadiene recognized as a highly reactive volatile organic compound (HRVOC)?
A) Potential to form ozone B) Ability to acidify rain C) High solubility in water D) Contribution to smog visibility
- 16. Which agency regulates emissions of 1,3-butadiene in the Houston-Brazoria-Galveston area?
A) EPA B) TCEQ C) OSHA D) FDA
- 17. What is the primary starting material for the dehydrogenation process used to produce butadiene?
A) calcium carbide B) acetylene C) ethanol D) n-butane
- 18. In what year did the first post-war commercial plant for butadiene production from n-butane begin operations?
A) 1943 B) 2017 C) 1940 D) 1957
- 19. Which process is currently used for the commercial production of butadiene from n-butane?
A) Ostromislensky process B) Lebedev process C) Steam cracking D) Houdry Catadiene process
- 20. Which chemicals are used as catalysts in the Houdry Catadiene process?
A) Tantalum and silica B) Calcium carbide C) Alumina and chromia D) Metal oxides only
- 21. Which individual developed the single-step process for converting ethanol into butadiene?
A) Houdry B) Ivan Ostromislensky C) The Rubber Reserve Company D) Sergey Lebedev
- 22. What are the byproducts of the single-step ethanol-to-butadiene process?
A) Hydrogen and water B) Calcium carbide and carbon dioxide C) Chromia and alumina D) Acetaldehyde and silica
- 23. At what temperature range does the single-step ethanol process operate?
A) 400–450 °C B) 500–600 °C C) 200–250 °C D) 325–350 °C
- 24. Which Russian chemist developed the two-step process for producing butadiene from ethanol?
A) None of the above B) Ivan Ostromislensky C) Sergey Lebedev D) Houdry
- 25. In the two-step ethanol process, what is ethanol first oxidized into?
A) Butene B) Hydrogen C) Acetaldehyde D) Water
- 26. What catalyst is used in the two-step ethanol-to-butadiene process?
A) Tantalum-promoted porous silica B) Alumina and chromia C) Metal oxide D) Calcium carbide
- 27. What was the initial source of butadiene for the Louisville, Kentucky plant?
A) n-Butane B) Steam cracking C) Ethanol only D) Acetylene
- 28. As of 2017, what is the status of industrial butadiene production from ethanol?
A) It is used in Brazil only B) None was produced C) It is used in the US only D) It is the primary method
- 29. Why is the ethanol-to-butadiene process still considered viable for some regions?
A) Lower capital costs B) It uses cheaper catalysts C) Higher output volumes D) Better efficiency than steam cracking
- 30. Where were the plants for the United States Synthetic Rubber Program located in the 1940s?
A) Houston, Institute, and Louisville B) Brazil, China, and India C) Russia, Europe, and India D) Borger, Toledo, and El Segundo
- 31. What is the primary disadvantage of producing butadiene from ethanol compared to steam cracking?
A) Not competitive for large volumes B) Lack of available catalysts C) Higher capital costs D) Requires higher temperatures
- 32. What is the chemical formula of 1,3-butadiene?
A) CH3-CH=CH-CH3 B) CH2=CH2 C) CH2=C=CH-CH3 D) CH2=CH-CH=CH2
- 33. What is the physical state of butadiene at room temperature and pressure?
A) Colorless gas B) Viscous liquid C) Metallic plasma D) Solid
- 34. What type of hydrocarbon is 1,3-butadiene?
A) Aromatic ring B) Alkyne C) Conjugated diene D) Alkane
- 35. Why is butadiene found in the air of urban areas?
A) Natural volcanic activity B) Agricultural runoff C) Emission by motor vehicles D) Water treatment plants
- 36. Who first isolated butadiene in 1863?
A) Sergei Lebedev B) Eduard Tschunker C) E. Caventou D) Walter Bock
- 37. What did Sergei Lebedev achieve in 1910?
A) Polymerized butadiene B) Isolated butadiene from petroleum C) Developed extractive distillation D) Invented steam cracking
- 38. What type of rubber did early butadiene polymers resemble?
A) Silicone rubber B) Neoprene C) Natural rubber D) Nitrile rubber
- 39. What was the estimated production of butadiene in 2020?
A) 20.1 million tons B) 8.8 million tons C) 5.5 million tons D) 14.2 million tons
- 40. In the United States, how is butadiene primarily produced?
A) Fermentation of grain B) Direct synthesis from methane C) Byproduct of steam cracking D) Coal gasification
- 41. Which solvent is used for the extractive distillation of butadiene?
A) Ethanol B) Water C) Benzene D) Acetonitrile
- 42. Which type of feed produces more butadiene during steam cracking?
A) Hydrogen gas B) Methane C) Ethane D) Heavier feeds
- 43. What is 1,2-butadiene classified as?
A) An allene B) A saturated alkane C) A conjugated diene D) An aromatic compound
- 44. During which historical period did the butadiene industry originate?
A) After the Cold War B) Before World War II C) During the Industrial Revolution D) In the early 19th century
- 45. Why is 1,2-butadiene not considered important industrially?
A) It is highly toxic B) It is a solid at room temperature C) It has no industrial importance D) It is too expensive to produce
- 46. Which material is used as a convenient solid storable source for 1,3-butadiene in laboratory settings?
A) Cyclohexene B) Chloroprene C) Sulfolene D) Adiponitrile
- 47. Which process converts butadiene into adiponitrile?
A) Polymerization B) Dimerization C) Hydrocyanation D) Trimerization
- 48. What is the most common material used for the production of automobile tires?
A) Polybutadiene (PB) B) Polybutadiene acrylonitrile (PBAN) C) Acrylonitrile butadiene styrene (ABS) D) Styrene-butadiene (SBR)
- 49. What substance accumulates as a common impurity when butadiene is stored?
A) Vinylcyclohexene B) 1-octene C) Cyclododecatriene D) Sulfolane
- 50. Which polymer is used as a binder for ammonium perchlorate composite propellant (APCP) in the Space Shuttle?
A) PBAN B) ABS C) NBR D) SBR
- 51. What type of catalyst is often used for the dimerization and trimerization of butadiene?
A) Iron-based catalysts B) Copper-based catalysts C) Palladium-based catalysts D) Nickel- or titanium-containing catalysts
- 52. What does the trimerization of butadiene produce?
A) 4-vinylcyclohexene B) Cyclododecatriene C) Cyclooctadiene D) 1-methoxy-2,7-octadiene
- 53. What is the product of the palladium-catalyzed telomerization of butadiene with methanol?
A) 1-octene B) Adiponitrile C) Chloroprene D) Sulfolane
- 54. Which copolymer is specifically mentioned as being used by amateur rocketeers due to its reduced curing temperature?
A) HTPB B) NBR C) SBR D) ABS
- 55. What byproduct is released when sulfolene is heated to generate butadiene?
A) Hydrogen cyanide B) Sulfur dioxide C) Methanol D) Chlorine
- 56. Which company patented a process to produce butadiene from normal butenes via oxidative dehydrogenation in the 1960s?
A) Baton Rouge Chemicals B) Torrance Industrial C) USSRP D) Petro-Tex
- 57. Which conformation of 1,3-butadiene is the most stable?
A) s-cis B) s-trans C) gauche D) eclipsed
- 58. What is the C2-C3 dihedral angle of the s-trans conformation?
A) 0° B) 180° C) 38° D) 90°
- 59. What is the C2-C3 dihedral angle of the s-cis conformation?
A) 45° B) 0° C) 180° D) 38°
- 60. How much higher in energy is the s-cis conformation compared to s-trans?
A) 16.5 kJ/mol B) 12.0 kJ/mol C) 3.5 kJ/mol D) 24.8 kJ/mol
- 61. What is the dihedral angle of the gauche conformer of 1,3-butadiene?
A) 90° B) 0° C) Around 38° D) 180°
- 62. How much higher in energy is the gauche conformer compared to the s-trans conformer?
A) 3.5 kJ/mol B) 16.5 kJ/mol C) 12.0 kJ/mol D) 24.8 kJ/mol
- 63. What is the rotational barrier between the two conformers of 1,3-butadiene?
A) 12.0 kJ/mol B) 16.5 kJ/mol C) 24.8 kJ/mol D) 3.5 kJ/mol
- 64. What does the small degree of partial double bond character in the C–C single bond suggest?
A) High steric hindrance B) Isolated double bonds C) A delocalized pi system D) A completely single C-C bond
- 65. Which reaction requires 1,3-butadiene to assume the s-cis conformation?
A) Hydrogenation B) Polymerization C) Diels-Alder reaction D) Combustion
- 66. What is the length of the double bond in s-trans-butadiene?
A) 133.0 pm B) 140.0 pm C) 133.8 pm D) 120.0 pm
- 67. What is the approximate resonance energy of 1,3-butadiene?
A) 3.5 kcal/mol B) 30.3 kcal/mol C) 60.6 kcal/mol D) 57.1 kcal/mol
- 68. Which theory is used to obtain a qualitative picture of 1,3-butadiene's molecular orbitals?
A) VSEPR theory B) Valence Bond theory C) Hückel theory D) Resonance theory
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