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Question

Addition of NaHSO3 to carbonyl comounds is an example of :

A
Nucleophilic addition
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B
Nucleophilic substitution
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C
Electrophilic substitution
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D
Electrophilic addition
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Solution

The correct option is A Nucleophilic addition
NaHSO3 addition is an example of nucleophilic addition reaction.
Mechanism of addition of NaHSO3 involves 2 steps.
Step-1:Nucleophilic attack on ​carbonyl carbon:

Step-2: Formation of an adduct
Hence, the correct answer is option (a).

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