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Chapter 9: Substitution and Elimination Reactions of Alkyl Halides
Exercises
Practice Exercise 2
Practice Exercise 2
This activity contains 7 questions.
If an alkyl halide undergoes both S
N
1 and S
N
2 reactions with methoxide ion in 75% ethanol/25% water, which of the following would increase the percentage of product produced by the S
N
2 reaction?
decrease the concentration of the alkyl halide
decrease the concentration of methoxide ion
change the nucleophile to methanol
increase the concentration of methoxide ion
increase the concentration of the alkyl halide
Which of the following alkyl halides is the most reactive in an S
N
1 reaction?
tert
-butyl bromide
tert
-butyl chloride
All are equally reactive.
tert
-butyl iodide
tert
-butyl fluoride
Which of the following alkyl halides is the most reactive in an S
N
2 reaction?
1-bromo-2-methylpropane
1-bromobutane
2-bromopropane
1-chlorobutane
1-bromo-2,3-dimethylpropane
Which statement describes the kinetics of an E2 reaction?
second-order in alkyl halide, and second-order overall
first-order in alkyl halide, first-order in base, and first-order overall
second-order in alkyl halide, first-order in base, and second-order overall
first-order in alkyl halide, and first-order overall
first-order in alkyl halide, first-order in base, and second-order overall
How many beta carbons are there in 2-bromobutane, and how many of these are secondary carbons?
no beta carbons
2 beta carbons, 2 secondary beta carbons
2 beta carbons, 1 secondary beta carbon
1 beta carbon, 0 secondary beta carbons
2 beta carbons, 0 secondary beta carbons
Which of the following compounds would be the most reactive in an E1 reaction?
3-chloro-6-methylcyclohexene
5-chloro-3-methylcyclohexene
1-chloro-3-methylcyclohexene
3-chloro-3-methylcyclohexene
4-chloro-3-methylcyclohexene
Which of the following is
not
a true statement?
If there are two hydrogens on the beta carbon, both
E
and
Z
isomers will be formed in an E2 reaction.
Both
E
and
Z
isomers will be formed in an E1 reaction.
The major product of an E1 reaction will be the alkene that has the bulkiest groups on opposite sides of the double bond.
If there are two hydrogens on the beta carbon, the major product of an E2 reaction will be the alkene that has the bulkiest groups on opposite sides of the double bond.
Only the
E
isomer is formed in an E2 reaction.
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