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Chapter 5: The Reactions of Alkenes and Alkynes: An Introduction to Multi-step Synthesis
Quizzes
Quiz 2
Quiz 2
This activity contains 15 questions.
Which of the following is a correct name?
5-ethyl-3-hexyne
1-chloro-3-butyne
6-methyl-3-octyne
4-heptyne
2-methyl-2-butyne
Which of the following is
not
a true statement?
A triple bond is shorter than a double bond.
Butyne is more acidic than butane.
A triple bond consists of two sigma bonds and one pi bond.
An electron in an
sp
orbital is (on average) closer to the nucleus than an electron in an
sp
2
orbital.
Identify the pair of structures that are
not
tautomers.
CH
3
CH
2
-CH=NH and CH
3
CH=CHNH
2
CH
3
CH=CH(OCH
3
) and CH
3
CH=C(OH)-CH
3
CH
3
CH=CHOH and CH
3
CH
2
-CH=O
CH
3
CH
2
-C(=O)-CH
2
CH
3
and CH
3
CH=C(OH)-CH
2
CH
3
CH
3
CH
2
-C(=O)-CH
3
and CH
3
CH=C(OH)-CH
3
Which of the following compounds will be formed when 3-heptyne undergoes acid-catalyzed hydration?
a: CH
3
CH
2
-C(=O)-CH
2
CH
2
CH
2
CH
3
b: CH
3
CH
2
CH
2
-C(=O)-CH
2
CH
2
CH
2
CH
3
c: CH
3
CH
2
CH
2
-C(=O)-CH
2
CH
2
CH
3
mixture of a and b
mixture of a and c
Chain-growth polymers make up one of the two major classes of synthetic polymers. The other is
natural polymers.
copolymers.
step-growth polymers.
biopolymers.
Polystyrene and polyvinyl chloride are examples of
natural polymers.
rubber.
synthetic polymers.
urethanes.
Which represents the correct relative electronegativities?
sp
<
sp
2
<
sp
3
sp
<
sp
2
<
sp
3
sp
>
sp
3
>
sp
2
sp
<
sp
3
<
sp
2
sp
>
sp
2
>
sp
3
Acetylide ions are used
to convert terminal alkynes into larger terminal alkynes.
to convert tin into gold.
to convert terminal alkynes into larger internal alkynes.
to convert internal alkynes into terminal alkynes.
to convert internal alkynes into larger internal alkynes.
What sequence of reactions will convert 1-heptyne into 4-decyne?
1. NaNH
2
2. CH
3
CH
2
CH
2
CH
2
Br
1. NaNH
2
2. CH
3
CH
2
CH
2
Br
1. NaNH
2
2. CH
3
CH
2
Br
1. NaNH
2
2. CH
3
CH
2
CH
2
CH
2
CH
2
Br
1. NaNH
2
2. CH
3
Br
What combination of alkyne and alkyl halide would be the best to use for the synthesis of 4-octyne?
2-butyne and 1-bromobutane
1-heptyne and bromomethane
1-pentyne and 1-bromopropane
1-butyne and 1-bromobutane
1-hexyne and bromoethane
Which of the following represents the correct relative acidities?
water > ammonia > ethyne > ethane > ethene
water > ethyne > ammonia > ethene > ethane
ammonia > water > ethyne > ethane > ethene
water > ethyne > ammonia > ethane > ethene
ethyne > water > ammonia > ethene > ethane
Which of the following ketones has more than one tautomer?
(CH
3
)
2
CHCH
2
-C(=O)-CH
2
CH(CH
3
)
2
(CH
3
)
2
CH-C(=O)-CH(CH
3
)
2
CH
3
CH
2
-CH(-OH)-CH
3
CH
3
CH
2
CH
2
-C(=O)-CH
2
CH
3
CH
3
-C(=O)-CH
3
Biopolymers and ___________ constitute the two major groups of polymers.
synthetic polymers
copolymers
chain-growth polymers
step-growth polymers
What starting material would you use to form -(CH(Cl)CH(Cl))
n
- ?
ethene and Cl
2
acetylene and Cl
2
1,2-dichloroethene
1,1-dichloroethene
Which sequence of reagents would you use to synthesize 2-butanol from propyne?
1.
-
NH
2
2. CH
3
Br 3. H
2
/Lindlar's catalyst 4. H
2
O
1.
-
OH 2. CH
3
Br 3. H
2
/Lindlar's catalyst 4. H
+
/H
2
O
1.
-
NH
2
2. CH
3
CH
2
Br 3. H
2
/Lindlar's catalyst 4. H
+
/H
2
O
1.
-
NH
2
2. CH
3
Br 3. H
2
4. H
+
/H
2
O
1.
-
NH
2
2. CH
3
Br 3. H
2
/Lindlar's catalyst 4. H
+
/H
2
O
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