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Byju's Answer
Standard XII
Chemistry
Preparation of Carboxylic Acids
CH 3 CH=CHCHO...
Question
C
H
3
C
H
=
C
H
C
H
O
is oxidised to
C
H
3
−
C
H
=
C
H
C
O
O
H
, using oxidising agent as :
A
alkaline
K
M
n
O
4
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B
K
2
C
r
2
O
7
/
c
o
n
c
.
H
2
S
O
4
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C
ammoniacal
A
g
N
O
3
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D
dilute4
H
N
O
3
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Solution
The correct option is
C
ammoniacal
A
g
N
O
3
C
H
3
C
H
=
C
H
C
H
O
+
[
O
]
→
C
H
3
−
C
H
=
C
H
C
O
O
H
on analyzing above reaction we find that we have to use that oxidizing agent which retain the double bond and oxidized
−
C
H
O
into
−
C
O
O
H
.
Now,
we have Option A,B,and D are strong oxidizing agent which can oxidised
−
C
H
O
a
s
w
e
l
l
a
s
d
o
u
b
l
e
Thus, we will use mild oxidising agent
a
m
m
o
n
i
c
a
l
A
g
N
O
3
(
T
o
l
l
e
n
′
s
r
e
a
g
e
n
t
)
to carry out above reaction.
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Similar questions
Q.
Consider the following list of reagents:
Acidified
K
2
C
r
2
O
7
, alkaline
K
M
n
O
4
,
C
u
S
O
4
,
H
2
O
2
,
C
l
2
,
O
2
,
F
e
C
l
2
,
H
N
O
3
and
N
a
2
S
2
O
3
. The total number of reagents that can oxidise aqueous iodide to iodine is:
Q.
Assertion :
K
M
n
O
4
is a stronger oxidising agent than
K
2
C
r
2
O
7
. Reason: This is due to the increasing stability of the lower species to which they are reduced.
Q.
K
2
C
r
2
O
7
+
c
o
n
c
.
H
2
S
O
4
+
H
2
O
2
+
e
t
h
e
r
⟶
blue perchromic anhydride (in ethereal layer). Blue colour is due to
:
Q.
K
M
n
O
4
acts as on oxidising agent in alkaline medium. When alkaline
K
M
n
O
4
is treated with KI, iodide ion is oxidised to :
Q.
Balance the following equation by oxidation number method
i)
K
2
C
r
2
O
7
+
K
I
+
H
2
S
O
4
→
K
2
S
O
4
+
C
r
2
(
S
O
4
)
3
+
I
2
+
H
2
O
ii)
K
M
n
O
4
+
N
a
2
S
O
3
→
M
n
O
2
+
N
a
2
S
O
4
+
K
O
H
iii)
C
u
+
H
N
O
3
→
C
u
(
N
O
3
)
2
+
N
O
2
+
H
2
O
iv)
K
M
n
O
4
+
H
2
C
2
O
4
+
H
2
S
O
4
→
K
2
S
O
4
+
M
n
S
O
4
+
C
O
2
+
H
2
O
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