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Question
Chemistry
Iodoform test is not given by
Q. Iodoform test is not given by
1194
149
MHT CET
MHT CET 2008
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A
2
-pentanon
B
ethanol
C
ethanal
D
3
-pentanone
Solution:
Iodoform test is given by compounds which have
(
C
H
3
—
CO
—
)
group or
group, Hence, 2 -pentanone,
C
H
3
C
H
O
and
C
2
H
5
O
H
give this test. But 3-pentanone
(
C
H
3
C
H
2
COC
H
2
C
H
3
)
does not give iodoform test.
2 - pentanone
(
C
H
3
COC
H
2
C
H
2
C
H
3
)
+
3
I
2
+
4
N
a
O
H
→
iodoform (yellow ppt)
C
H
I
3
↓
+
C
H
3
C
H
2
C
H
2
COON
a
+
3
N
a
I
+
3
H
2
O
ethanal
C
H
3
−
C
H
O
+
3
I
2
+
4
N
a
O
H
→
iodoform (yellow ppt.)
C
H
I
3
↓
+
H
COON
a
+
3
N
a
I
+
3
H
2
O
ethanal
C
2
H
5
O
H
+
4
I
2
+
6
N
a
O
H
→
iodoform(yellow ppt.)
C
H
I
3
↓
+
H
COON
a
+
5
N
a
I
+
5
H
2
O
3 - pentanone
C
H
3
−
C
H
2
−
CO
−
C
H
2
−
C
H
3
+
I
2
+
N
a
O
H
→
No reaction
