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Standard VI
Chemistry
Respiration
32. what is t...
Question
32. what is the meaning of:: alpha -D-glucose beta-D-glucose alpha or -D(-)-glucose also the significance of (-) sign
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Q.
The enantiomer of
α
−
D
−
(
+
)
−
glucose is ?
Q.
Following enthalpy changes are given:
α
−
D
g
l
u
c
o
s
e
(
s
)
→
α
−
D
g
l
u
c
o
s
e
(
a
q
)
;
Δ
H
=
10.72
k
J
β
−
D
g
l
u
c
o
s
e
(
s
)
→
β
−
D
g
l
u
c
o
s
e
(
a
q
)
;
Δ
H
=
4.68
k
J
α
−
D
g
l
u
c
o
s
e
(
s
)
→
β
−
D
g
l
u
c
o
s
e
(
a
q
)
;
Δ
H
=
1.16
k
J
Calculate enthalpy change in
α
−
D
g
l
u
c
o
s
e
(
s
)
→
β
−
D
g
l
u
c
o
s
e
(
s
)
(n kJ)
Q.
Following enthalpy changes are given:
α
−
D
g
l
u
c
o
s
e
(
s
)
⟶
α
−
D
g
l
u
c
o
s
e
(
a
q
.
)
;
Δ
H
=
10.72
k
J
β
−
D
g
l
u
c
o
s
e
(
s
)
⟶
β
−
D
g
l
u
c
o
s
e
(
a
q
.
)
;
Δ
H
=
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
=
1.16
k
J
Calculate the enthalpy change in,
α
−
D
g
l
u
c
o
s
e
(
s
)
⟶
β
−
D
g
l
u
c
o
s
e
(
s
)
Q.
Equimolar mixture of a
α
−
D
(
+
)
- glucose and
β
−
D
(
+
)
-glucose has specific rotation (
[
α
]
D
) is:
Q.
The equilibrium constant for mutarotation
α
−
D
Glucose
⇌
β
−
D
Glucose
1.8
. What percentage of
α
form remains at equilibrium?
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