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JEE Main Chemistry Class 11 Organic Chemistry Some Basic Principles and Techniques 2 Questions
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© examsnet.com
Question : 99
Total: 100
________ grams of 3-hydroxy propanal
(
M
W
=
74
)
must be dehydrated to produce
7.8
g
of acrolein
(
M
W
=
56
)
(
C
3
H
4
O
)
, if the percentage yield is 64 (Round off to the nearest integer). [Given: Atomic masses :
C
=
12.0
u
,
H
=
1.0
u
,
O
=
16.0
u
]
[18 Mar 2021 Shift 1]
Your Answer:
Validate
Solution:
On reaction
H
O
−
C
H
2
−
C
H
2
−
C
H
O
3-hydroxy propanal
(
mol
.
wt
=
74
)
Δ
⟶
64
C
3
H
4
O
+
H
2
O
Acrolein
(
mol
.
w
t
=
56
)
Let's assume required man of 3-hydroxypropanal be
x
to produce
0.64
g
acrolein.
∴
Number of moles
=
x
/
74
Now,
7.8
g
of acrolein gives,
x
74
×
0.64
=
7.8
/
56
⇒
x
=
16.10
or
x
≅
16.00
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