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Byju's Answer
Standard XII
Chemistry
Nucleophilic Substitution in Aryl Halides
At pH=4, gl...
Question
At
p
H
=
4
, glycine exists as:
A
H
3
⊕
N
−
C
H
2
C
O
⊖
O
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B
H
3
⊕
N
−
C
H
2
C
O
O
H
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C
H
2
N
C
H
2
C
O
O
H
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D
H
2
N
C
H
2
C
O
⊖
O
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Solution
The correct option is
A
H
3
⊕
N
−
C
H
2
C
O
O
H
At
p
H
=
4
(acidic range), glycine reacts with
H
⊕
ion as:
H
3
⊕
N
−
C
H
2
C
O
⊖
O
Z
w
i
t
t
e
r
i
o
n
H
⊕
−
−
→
H
3
N
+
−
C
H
2
−
C
O
O
H
Hence, option B is correct.
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Similar questions
Q.
H
2
O
+
H
3
P
O
4
⇌
H
3
O
+
+
H
2
P
O
−
4
;
p
K
1
=
2.15
H
2
O
+
H
2
P
O
−
4
⇌
H
3
O
+
+
H
2
P
O
2
−
4
;
p
K
2
=
7.20
Hence, pH of
0.01
M
N
a
H
2
P
O
4
is:
Q.
Calculate pH of
1
M
N
a
H
C
O
3
. Given
H
2
C
O
3
+
H
2
O
⇌
H
C
O
−
3
+
H
3
O
+
;
p
K
1
=
6.38
H
C
O
−
3
+
H
2
O
⇌
C
O
2
−
3
+
H
3
O
+
;
p
K
2
=
10.26
Q.
Complete the reaction
P
h
−
C
H
=
C
H
−
C
H
O
P
h
M
g
B
r
⟶
H
3
O
+
P
r
o
d
u
c
t
Q.
Three reactions involving
H
2
P
O
−
4
are given below:
(i)
H
3
P
O
4
+
H
2
O
→
H
3
O
+
+
H
2
P
O
−
4
(ii)
H
2
P
O
−
4
+
H
2
O
→
H
P
O
2
−
4
+
H
3
O
+
(iii)
H
2
P
O
−
4
+
O
H
−
→
H
3
P
O
4
+
O
2
−
Q.
How many of following are electrophile?
C
⊕
H
3
,
⊕
N
H
4
,
H
3
O
⊕
,
C
O
2
,
S
O
3
,
C
⊖
H
3
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