Orgo 2311: Exam 3 True/False – Flashcards
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trans-2-heptene is thermodynamically less stable than 1-heptene
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F
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(b) trans-2-butene is thermodynamically more stable than cis-2-butene but cis-cyclooctene is more stable than trans-cyclooctene.
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T
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Whenever an elimination reaction occurs to give the less stable, less highly substituted alkene, the elimination process is said to follow the Hofmann rule.
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T
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When an elimination reaction occurs to give the most stable, most highly substituted alkene, the elimination process is said to follow the Zaitsev rule
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T
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The preferential formation of one product, because the free energy of activation leading to its formation is lower than that for another product, is termed thermodynamic control
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F
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Bulky organic bases such as potassium tert-butoxide in tert-butyl alcohol are employed in elimination reaction of 2-bromo-2-methyl butane in order to form the less stable alkene product
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T
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The tert-butyl carbocation is a Lewis base
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F
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Alcohols can be Lewis bases
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T
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A secondary carbocation is less stable than a tertiary carbocation
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T
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A geminal dihalide has halogen atoms on adjacent carbon atoms
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F
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Aceylene is more acidic than ethylene
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T
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The heterogeneous addition of hydrogen (H2 + Pt) to 2-butyne results in the preferential formation of trans-2-butene.
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F
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The addition of hydrogen to 1-butene in the presence of a Pt catalyst is highly endothermic.
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F
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The lowest energy geometry for the E2 transition state is the anti-coplanar arrangement of the beta C-H bond and C-X bond
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T
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In general, eliminations reactions are favored over competing substitution reactions at lower temperatures
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F
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A carbanion is an intermediate in the E1 process
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F
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Acetylene is a stronger acid than ethanol
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F
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When trans-2-methylcyclohexanol is subjected to acid-catalyzed dehydration, the major product is 1-methylcyclohexene
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T
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When trans-1-bromo-2-methylcyclohexane is reacted with sodium ethoxide in ethanol, the major product is 3-methylcyclohexene
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F
