Whether the A-A base pair is complementary base pair in DNA molecules has to be stated. Concept introduction: In DNA double helix base pairs are bonded together by hydrogen bonds. In DNA, purine (adenine and guanine) base pairs bond with pyrimidines (cytosine and thymine).
Whether the A-A base pair is complementary base pair in DNA molecules has to be stated. Concept introduction: In DNA double helix base pairs are bonded together by hydrogen bonds. In DNA, purine (adenine and guanine) base pairs bond with pyrimidines (cytosine and thymine).
Solution Summary: The author explains that DNA double helix base pairs are bonded together by hydrogen bonds. In DNA molecules, A–T and G–C pairings are most favorable for hydrogen bonding.
Interpretation: Whether the A-A base pair is complementary base pair in DNA molecules has to be stated.
Concept introduction: In DNA double helix base pairs are bonded together by hydrogen bonds. In DNA, purine (adenine and guanine) base pairs bond with pyrimidines (cytosine and thymine).
(b)
Interpretation Introduction
Interpretation: Whether the A-C base pair is complementary base pair in DNA molecules has to be stated.
Concept introduction: In DNA double helix base pairs are bonded together by hydrogen bonds. In DNA, purine (adenine and guanine) base pairs bond with pyrimidines (cytosine and thymine).
(c)
Interpretation Introduction
Interpretation: Whether the A-C base pair is complementary base pair in DNA molecules has to be stated.
Concept introduction: In DNA double helix base pairs are bonded together by hydrogen bonds. In DNA, purine (adenine and guanine) base pairs bond with pyrimidines (cytosine and thymine).
(d)
Interpretation Introduction
Interpretation: Whether the G-T base pair is complementary base pair in DNA molecules has to be stated.
Concept introduction: In DNA double helix base pairs are bonded together by hydrogen bonds. In DNA, purine (adenine and guanine) base pairs bond with pyrimidines (cytosine and thymine).
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Solution
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Use retrosynthetic analysis to suggest two paths to synthesize 2-methyl-3-hexanol using the Grignard reaction. (Click and drag
the appropriate image to the correct position in the reactions.)
Route 1
Aldehyde 1
or
+98
Aldehyde 2
Route 2
Q6
+100
Solved in 1 attempt
Q7
+95
Solved in 2 attempts
Q8
+98
Unlimited attempts
possible
+
+
Grignard 1
OH
H3O+
Grignard 2
Answer Bank
Q9
+90
MgBr
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possible
CH3CH2CH2MgBr
Q10
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Q11
?
?
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in 1 attempt
2-methyl-3-hexanol
CH3CH2MgBr
H
H
о
H
Attempt 3
2) (4 pt) After the reaction was completed, the student collected the following data. Crude
product data is the data collected after the reaction is finished, but before the product
is purified. "Pure" product data is the data collected after attempted purification using
recrystallization.
Student B's data:
Crude product data
"Pure"
product data
after
recrystallization
Crude mass: 0.93 g grey solid
Crude mp: 96-106 °C
Crude % yield:
Pure mass: 0.39 g white solid
Pure mp: 111-113 °C
Pure % yield:
a) Calculate the crude and pure percent yields for the student's reaction.
b) Summarize what is indicated by the crude and pure melting points.
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