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Byju's Answer
Standard XII
Biology
Pyranose and Furanose
Pick up the c...
Question
Pick up the correct statement from the following:
A
Glucose exists in two different crystalline forms,
α
−
D
−
glucose and
β
−
D
−
glucose.
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B
Cyclic structure of
α
−
D
−
glucose and
β
−
D
−
glucose is called pyranose structure.
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C
α
−
D
−
-glucose and
β
−
D
−
glucose are enantiomers.
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D
Cellulose is a straight chain polysaccharide made up of only
β
- glucose units.
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Solution
The correct option is
C
α
−
D
−
-glucose and
β
−
D
−
glucose are enantiomers.
α
-D-glucose and
β
-D-glucose are enantiomers.
The
α
-D-glucose and
β
-D-glucose are stereoisomers related to each other as non-superimposable mirror images and thus, both are enantiomers.
Cellulose is a straight chain polysaccharide made up of only
d -glucose
units.
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Q.
α
-D-glucose
and
β
-D-glucose
are called:
Q.
The enantiomer of
α
−
D
−
(
+
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Q.
α
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D
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-glucose and
β
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Q.
The enthalpy changes of some process are given below :
α
−
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g
l
u
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⟶
α
−
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−
g
l
u
c
o
s
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(
a
q
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;
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u
t
i
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β
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o
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D
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g
l
u
c
o
s
e
(
a
q
)
;
Δ
H
d
i
s
s
o
l
u
t
i
o
n
=
4.68
k
J
.
α
−
D
−
g
l
u
c
o
s
e
(
a
q
)
⟶
β
−
D
−
g
l
u
c
o
s
e
(
a
q
)
;
Δ
H
m
u
t
a
r
o
t
a
t
i
o
n
=
−
1.16
k
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The
Δ
H
∘
for
α
−
D
−
g
l
u
c
o
s
e
⟶
β
−
D
−
g
l
u
c
o
s
e
is :
Q.
If
α
−
D
−
g
l
u
c
o
s
e
is dissolved in water and kept for a few hours, the major constituent(s) present in the solution is (are)
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