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Byju's Answer
Standard XII
Chemistry
Curtius and Hofmann Rearrangements
When acetalde...
Question
When acetaldehyde reacts with semicarbazide, the product formed is
:
A
C
H
3
C
H
=
N
N
H
−
C
O
−
N
H
2
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B
C
H
3
C
H
=
N
C
O
N
H
N
H
2
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C
C
H
3
C
H
=
N
H
N
H
2
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D
C
H
3
−
C
O
−
N
H
−
C
O
N
H
2
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Solution
The correct option is
A
C
H
3
C
H
=
N
N
H
−
C
O
−
N
H
2
Acetaldehyde reacts with semicarbazide, product will be
C
H
3
C
H
=
N
N
H
−
C
O
−
N
H
2
.
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Similar questions
Q.
C
H
3
C
H
=
C
H
2
+
B
.
r
→
C
H
3
.
C
H
2
B
r
Q.
Number of stereoisomeric forms of the compound
C
H
3
C
H
=
C
H
C
H
B
r
−
C
H
3
is:
Q.
When semicarbazide reacts with a ketone(or aldehyde) to form semicarbazone. Only one nitrogen atom of semicarbazide acts as a nucleophile and attack the carbonyl carbon of the ketone. The product of the reaction consequently is
R
2
C
=
N
−
N
H
−
C
O
N
H
2
rather than
R
2
C
=
N
C
O
N
H
−
N
H
2
. What factor account for the fact that two nitrogen atoms of semicarbazide are relatively non nucleophilic?
Q.
C
H
3
−
(
C
H
3
)
C
H
−
C
H
2
−
C
H
3
C
l
2
,
h
v
−
−−−
→
N
(
isomeric products
)
C
5
H
11
C
l
fractional distillation
−
−−−−−−−−−−−
→
M
(
isomeric products
)
What are N and M (N and M are number of products formed) ?
Q.
Which organic compound among the following is not an isomer of
C
H
3
−
C
O
−
C
H
2
C
H
2
C
H
2
C
H
3
?
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