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JEE Advanced 2020 Full Test 7 Paper 1
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© examsnet.com
Question : 31
Total: 54
A polyhydric alcohol is acylated by using ethanoyl chloride in presence of alkali. It was observed that molecular mass of alcohol is increased to
237
%
on acylation. If the molecular mass of polyhydric alcohol is
92
,
then the number of
−
O
H
groups present in polyhydric alcohol are
Your Answer:
Validate
Solution:
R
O
H
C
H
3
C
O
C
l
─
─
─
─
─
─
─
▶
R
O
C
O
C
H
3
Here
H
is replaced by
C
O
C
H
3
i.e. one
H
of mass 1 is replaced by one
C
O
C
H
3
of mass
43
.
∴
Mass increased is
42
.
∴
Mass of acylated product is
=
92
×
237
100
=
218
∴
increase in mass
=
218
−
92
=
126
∴
number of
O
H
=
126
∕
42
=
3
© examsnet.com
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