Organic Chemistry Exam 4 EXAM WITH ANSWER AND
QUESTION 100% CORRECT
Students also studied
C
Practice questions for this set
Terms in this set (85)
acetylenes = alkynes
olefins = alkenes
E= trans
Z= cis
stability of cis vs. trans trans is more stable
, hydrogenation exothermic addition of H to an alkene
relate the heats of reaction for trans- 1-butene > cis-2-butene > trans-2-butene (most stable)
butene, cis-butene, and 1-butene.
stabilities of alkenes (substitution) tetra- > tri- > di-> mono- > un-
stabilities of alkenes (status) tertiary > secondary > primary
elimination reactions of alkyl halides a base (-HX)
require...
alkyl halide formula C2H5X
elimination reactions of alcohols H+, heat (-HOH)
require...
alcohol formula C2H5OH
dehydrohalogenation is E2
more alkylated = more stable
how to favor an E2 use a secondary or tertiary alkyl halide, use bulky
base if using a primary, use high concentration of
strong base, use high
temperature
why would a secondary or tertiary steric hindrance prevents substitution
alkyl halide be better for E2?
Zaitsev rule formation of the more substituted alkene is favored
with a small base
Hoffman rule formation of the less substituted alkene is favored with
a bulky base
how does the steric bulk of the base it has difficulty removing internal secondary H's so it
affect the Hoffman rule? just removes a primary
anti/syn - which is preferred? anti
what causes anti/syn? proper alignment of orbitals in developing pi bond
why is anti preferred? staggered, so lower energy
dehydration of alcohols order of tertiary > secondary > primary
reactivity
dehydration of alcohols description loss of H2O to yield alkene when heated with SA
QUESTION 100% CORRECT
Students also studied
C
Practice questions for this set
Terms in this set (85)
acetylenes = alkynes
olefins = alkenes
E= trans
Z= cis
stability of cis vs. trans trans is more stable
, hydrogenation exothermic addition of H to an alkene
relate the heats of reaction for trans- 1-butene > cis-2-butene > trans-2-butene (most stable)
butene, cis-butene, and 1-butene.
stabilities of alkenes (substitution) tetra- > tri- > di-> mono- > un-
stabilities of alkenes (status) tertiary > secondary > primary
elimination reactions of alkyl halides a base (-HX)
require...
alkyl halide formula C2H5X
elimination reactions of alcohols H+, heat (-HOH)
require...
alcohol formula C2H5OH
dehydrohalogenation is E2
more alkylated = more stable
how to favor an E2 use a secondary or tertiary alkyl halide, use bulky
base if using a primary, use high concentration of
strong base, use high
temperature
why would a secondary or tertiary steric hindrance prevents substitution
alkyl halide be better for E2?
Zaitsev rule formation of the more substituted alkene is favored
with a small base
Hoffman rule formation of the less substituted alkene is favored with
a bulky base
how does the steric bulk of the base it has difficulty removing internal secondary H's so it
affect the Hoffman rule? just removes a primary
anti/syn - which is preferred? anti
what causes anti/syn? proper alignment of orbitals in developing pi bond
why is anti preferred? staggered, so lower energy
dehydration of alcohols order of tertiary > secondary > primary
reactivity
dehydration of alcohols description loss of H2O to yield alkene when heated with SA
