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KEAM 2021 Physics and Chemistry Solved Paper
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Question : 81
Total: 120
Which one of the following is not correct with respect to properties of amines?
p
K
b
of aniline is more than that of methylamine.
Ethylamine is soluble in water whereas aniline is not.
Ethanamide on reaction with
B
r
2
and
N
a
O
H
gives ethylamine.
Ethylamine reacts with nitrous acid to give ethanol.
Aniline does not undergo Friedel-Crafts reaction.
Validate
Solution:
Instead of ethanamide, propanamide reacts with
B
r
2
in the presence of sodium hydroxide to give ethylamine.
C
H
3
C
H
2
C
O
N
H
2
Propanamide
B
r
2
─
─
─
─
▶
NaOH
C
H
3
C
H
2
N
H
2
Ethanamineor ethylamine
+
C
O
2
This reaction is known as Hofmann degeadation reaction.
So, (c) is incorrect about amines.
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