Consider the reaction:

RCHO+NH2NH2 —> RCH=N-NH2

What sort of reaction is it?

  • Option 1)

    Electrophilic addition - elimination reaction

  • Option 2)

    Free radical addition - elimination reaction

  • Option 3)

    Electrophilic substitution - elimination reaction

  • Option 4)

    Nucleophilic addition - elimination reaction

 

Answers (1)

As learnt in

Chemical properties of aldehydes and ketones -

Undergo nucleophilic addition reactions at carbon-oxygen double bond, hybridization of carbon changes from sp2 to  sp2.  Aldehydes are more reactive than ketones due to steric hindrance and  +I effect of an alkyl group.

-

 

 and

Addition of ammonia and its derivatives with aldehydes and ketones -

Product formation is favoured due to rapid dehydration of the intermediate to form  > C = NG

G\:\:may\:be\:\:-OH,\:\:-NH_{2},\:\:-NHC_{6}H_{5},\:\:-NHCONH_{2},\:\:etc

- wherein

 

 Addition product is formed and a water molecule is eliminated.


Option 1)

Electrophilic addition - elimination reaction

This option is incorrect

Option 2)

Free radical addition - elimination reaction

This option is incorrect

Option 3)

Electrophilic substitution - elimination reaction

This option is incorrect

Option 4)

Nucleophilic addition - elimination reaction

This option is correct

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