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JEE Main Chemistry Class 12 Amines Questions Part 1 Questions
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© examsnet.com
Question : 86
Total: 100
A compound with molecular mass 180 is acylated with
C
H
3
C
O
C
l
to get a compound with molecular mass
390
.
The number of amino groups present per molecule of the former compound is:
[2013]
2
5
4
6
Validate
Solution:
R
−
N
H
2
Mol
.
Mass
=
16
+
C
H
3
−
O
|
|
C
−
C
l
─
─
─
─
─
▶
−
H
C
l
R
−
N
H
−
O
|
|
C
−
C
H
3
Mol
.
Mass
=
58
Now since the molecular mass increases by 42 unit as a result of the reaction of one mole of
C
H
3
C
O
C
l
with one-NH, group and the given increase in mass is
(
390
−
180
)
210. Hence the number of
−
N
H
2
groups
=
210
∕
42
=
5
.
© examsnet.com
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