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Byju's Answer
Standard XII
Chemistry
Preparation of Carboxylic Acids
R-C≡ N+2 H R...
Question
R
−
C
≡
N
+
2
(
H
)
(
i
)
S
n
C
l
2
/
d
i
l
H
C
l
−
−−−−−−−−−
→
(
i
i
)
H
3
O
+
R
C
H
O
+
N
H
4
C
l
this reaction is known as:
A
Etard reaction
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B
Stephen reaction
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C
Hell-Vohlard-Zelinsky reaction
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D
Balz-Schiemann reaction
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Solution
The correct option is
B
Stephen reaction
Cyanides are oxidized or converted into aldehydes in Stephen reaction in the presence of stannous chloride in acidic medium.
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Similar questions
Q.
R
−
C
≡
N
+
2
H
(
i
)
S
n
C
l
2
/
d
i
l
.
H
C
l
−
−−−−−−−−−−
→
(
i
i
)
H
3
O
+
R
C
H
O
+
N
H
4
C
l
, this reaction is known as:
Q.
Match List-I with List-II.
List-I
List-II
(
a
)
Benzene
C
O
,
H
C
l
−
−−−−−−−−−−−
→
Anhyd.
A
l
C
l
3
/
C
u
C
l
(i) Hell-Volhard-Zelinsky reaction
(
b
)
R
−
O
|
|
C
−
C
H
3
N
a
O
X
−
−−−
→
(ii) Gattermann-Koch reaction
(
c
)
R
−
C
H
2
−
O
H
+
R
′
C
O
O
H
Conc.
H
2
S
O
4
−
−−−−−−
→
(iii) Haloform reaction
(
d
)
R
−
C
H
2
C
O
O
H
i
.
X
2
/
R
e
d
P
−
−−−−−−
→
i
i
.
H
2
O
(iv) Esterification
Choose the correct answer from the options given below.
Q.
The reaction
R
C
N
S
n
C
l
2
/
H
C
l
−
−−−−−−
→
(
A
)
H
2
O
−
−
→
R
C
H
O
+
N
H
4
C
l
is known as:
Q.
Write Hell Volhard Zelinsky (HVZ) reaction with equation
Q.
The compound that does not undergo Hell-Volhard-Zelinsky reaction is:
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