I don't understand. Can you help me to explain to me, please? Predict whether each of the monosaccharides shown below would give a positive or negative Benedict's test.a)c)CH₂OHTO=CHOHHOHCH₂OHnegativeExcept for fructose,ketoses give negativeBenedict's tests.b)O=CHOfructoseCH₂OHHHHOHOHCH₂OHAlthough fructose is a ketose (not analdose), it gives a positive Benedict'stest result. The reason for this is thatwhen fructose is in a hot basicsolution, it will undergo either of tworearrangement reactions (shown inyour lecture notes), in which it isconverted to glucose or mannose. Itis actually the glucose and mannosealdoses, not fructose, that aresubsequently oxidized to produce acolor change in Benedict's test.HHOHHOHOHHOHHCH₂OHpositiveAldoses give positiveBenedict's tests

The test is performed to check the presence of glucose in which some amount of benedicts solution is…

Answered: Benedict's test.

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Chemistry

Benedict's test.

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Question

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I don't understand. Can you help me to explain to me, please?

Predict whether each of the monosaccharides shown below would give a positive or negative Benedict's test.
a)
c)
CH₂OH
T
O=C
HO
H
H
OH
CH₂OH
negative
Except for fructose,
ketoses give negative
Benedict's tests.
b)
O=C
HO
fructose
CH₂OH
H
H
H
OH
OH
CH₂OH
Although fructose is a ketose (not an
aldose), it gives a positive Benedict's
test result. The reason for this is that
when fructose is in a hot basic
solution, it will undergo either of two
rearrangement reactions (shown in
your lecture notes), in which it is
converted to glucose or mannose. It
is actually the glucose and mannose
aldoses, not fructose, that are
subsequently oxidized to produce a
color change in Benedict's test.
H
HO
H
HO
H
OH
H
OH
H
CH₂OH
positive
Aldoses give positive
Benedict's tests

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