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Engineering
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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

 
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...
Engineering
106 Views   |  

Consider the following reaction:

  • Option 1)

    C6H5CHO

  • Option 2)

    C6H5OH

  • Option 3)

    C6H5COCH3

  • Option 4)

    C6H5Cl

 
As we learnt in Rosenmund's reaction - Acid chlorides are reduced in boiling xylene using Pd / Pt along with BeSO4. S or quinoline is used to poison  Pd / Pt to stop reduction of aldehyde further. - wherein   Option 1) C6H5CHO This option is correct Option 2) C6H5OH This option is incorrect Option 3) C6H5COCH3 This option is incorrect Option 4) C6H5Cl This option is incorrect
Engineering
772 Views   |  

Which of the following compounds will give yellow precipitate with iodine and alkali?

  • Option 1)

    Methyl acetate

  • Option 2)

    Acetamide

  • Option 3)

    2 - Hydroxypropane

  • Option 4)

    Acetophenone

 
As we learnt in Haloform reaction - - wherein         Option 1) Methyl acetate Incorrect Option 2) Acetamide Incorrect Option 3) 2 - Hydroxypropane Correct Option 4) Acetophenone Correct
Engineering
119 Views   |  

Consider the following reaction:

The product 'A' is:

  • Option 1)

    C6H5OH

  • Option 2)

    C6H5COCH3

  • Option 3)

    C6H5CI

  • Option 4)

    C6H5CHO

 
As we learnt in   This reaction is called Rosenmund reduction. Option 1) C6H5OH This option is incorrect. Option 2) C6H5COCH3 This option is incorrect. Option 3) C6H5CI This option is incorrect. Option 4) C6H5CHO This option is correct.
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