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Standard XII
Chemistry
Chemical Properties of Noble Gases
In the Canniz...
Question
In the Cannizzaro reaction given below,
2
P
h
−
C
H
O
−
O
H
⟶
P
h
−
C
H
2
O
H
+
P
H
C
O
⊕
2
, the slowest step is:
A
the attack of
⊕
O
H
at the carbonyl group
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B
the transfer of hydride to the carbonyl group
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C
the abstraction of proton from the carboxylic acid
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D
the deprotonation of
P
h
−
C
H
2
O
H
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Solution
The correct option is
B
the transfer of hydride to the carbonyl group
The mechanism of the Cannizzaro reaction involves 3 steps.
The first step is the addition of hydroxide ion to the carbonyl group. It is a reversible reaction.
The second step is the transfer of hydride ion from hydroxy alkoxide to another aldehyde molecule. It is slowest step.
The third step is the exchange of protons between the acid and alkoxide ion.
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Q.
In the Cannizzaro reaction given below:
2
P
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−
C
H
O
⊖
O
H
−
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→
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−
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2
O
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+
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C
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⊖
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the slowest step is:
Q.
In Cannizzaro reaction given below
2
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Q.
In Cannizzaro reaction given below:
P
h
−
C
H
O
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H
−
−
−−
→
P
h
−
C
H
2
−
O
H
+
P
h
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Q.
In the Cannizzaro reaction given below:
2
P
h
−
C
H
O
⊖
O
H
−
−
→
P
H
−
C
H
2
O
H
+
P
h
C
O
⊖
2
the slowest step is:
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In the cannizzaro reaction given below
2
P
h
−
C
H
O
O
H
−
−
−−−−−−−−−−
→
P
h
−
C
H
2
−
O
H
+
P
h
C
O
−
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the slowest step is:
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