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Class 12
>>
Chemistry
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Alcohols, Phenols and Ethers
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Hard Questions
Alcohols Phenols And Ethers
Chemistry
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>
Statement-1: In the fermentation process of molasses, along with yeast,
(
N
H
4
)
2
S
O
4
and
(
N
H
4
)
3
P
O
4
are added.
Statement-2: Both
(
N
H
4
)
3
P
O
4
and
(
N
H
4
)
2
S
O
4
act as food and help in the growth of yeast.
A
Statement-1 is True, statement-2 is True; statement-2 is a correct explanation for statement-1
B
Statement-1 is True, statement-2 is True; statement-2 is NOT a correct explanation for statement-1
C
Statement-1 is True, statement-2 is False
D
Statement-1 is False, statement-2 is True
Hard
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>
Which reagent can be used to convert ethanol to diethyl ether?
A
A
l
2
O
3
at
2
5
0
0
C
B
conc.
H
2
S
O
4
at
1
7
0
0
C
C
conc.
H
2
S
O
4
at
1
3
0
0
−
1
4
0
0
C
D
A
l
2
O
3
at
3
5
0
0
C
Hard
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>
Hydrogen chloride and
S
O
2
are the side products in the reaction of ethanol with thionyl chloride. Which of the following is main product in this reaction?
A
C
2
H
5
−
O
−
C
2
H
5
B
C
2
H
6
C
C
H
3
C
l
D
C
2
H
5
C
l
Hard
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>
An organic compound reacts with the carboxylic acid in presence of dehydrating agent to form an ester, the compound may be:
A
aldehyde
B
ester
C
alcohol
D
ketone
Hard
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>
The reaction ROH + HCl
⇔
RCl +
H
2
O
is reversible, so for the completion of the reaction we use along with the reactants.
A
Conc.
H
2
S
O
4
B
P
2
O
5
C
H
3
P
O
4
D
N
2
O
5
Hard
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>
STATEMENT-1: The boiling point of
C
2
H
5
O
H
is less than that of
H
2
O
though the molecular weight of
C
2
H
5
O
H
is more than that of water.
STATEMENT-2:
C
2
H
5
O
H
molecules are not highly associated through hydrogen bonding as in water.
A
STATEMENT-1 is True, STATEMENT-2 is True; STATEMENT-2 is a correct explanation for STATEMENT-1
B
STATEMENT-1 is True, STATEMENT-2 is True; STATEMENT-2 is NOT a correct explanation for STATEMENT-1
C
STATEMENT-1 is True, STATEMENT-2 is False
D
STATEMENT-1 is False, STATEMENT-2 is True
Hard
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>
Which of the following substance can be used as a raw material for obtaining alcohol?
A
Potatoes
B
Molasses
C
Maize
D
All of the above
Hard
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>
Oxymercuration-demercuration reaction
(
H
g
(
O
A
c
)
2
/
T
H
F
−
H
2
O
)
followed by
(
N
a
B
H
4
,
C
2
H
5
O
H
)
on
C
H
3
C
H
=
C
H
2
produces
:
A
C
H
3
C
H
2
C
H
2
C
O
B
C
H
3
C
H
(
O
H
)
C
H
3
C
C
H
3
C
H
(
O
H
)
C
H
2
O
H
D
C
H
3
C
O
C
H
3
Hard
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>
Which of the following catalyst is used in the conversion of water gas and hydrogen into methyl alcohol?
A
M
n
O
B
Raney
N
i
C
F
e
D
Z
n
O
−
C
r
2
O
3
Hard
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>
In which one of the following reagents
O
−
H
bond fission in alcohol can not take place?
A
Na
B
C
H
3
C
O
O
H
C
C
H
3
M
g
B
r
D
P
C
l
5
Hard
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>
