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Aldehydes And Ketones Test - 30
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Aldehydes And Ketones Test - 30
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  • Question 1/10
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    Catalyst SnCl2​/HCl is used in 

    Solutions

    Catalyst SnCl2​/HCl is used in Stephen’s reaction. which helps in formation of nascent hydrogen on reacting with acid. The Stephen's reaction is used to prepare aldehydes from nitriles or cyanides. The reduction of nitriles with stannous chloride and hydrogen chloride in ethyl acetate solvent produces imine intermediate.

     

  • Question 2/10
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    The appropriate reagent for the transformation :

    Solutions

    In this reaction, a CO group is converted to CH2​ group. This can be achieved by Wolff-Kishner reduction which uses reagent NH2​NH2​, OH (hydrazine in alkaline medium).
    Clemmensen reduction (Zn(Hg)/HCl) cannot be used as in presence of HCl, the alcohol may undergo dehydration.

     

  • Question 3/10
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    Fehling's solution is a mixture of two solutions. While one solution contains CuSO4​, the other contains

    Solutions

    Fehling's solution consists of CuSO4​ solution mixed with alkaline solution of sodium potassium tartrate also called Rochelle salt.

     

  • Question 4/10
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    The below reaction is known as

    Solutions

    Benzilic acid rearrangement

     

  • Question 5/10
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    The reagents which can be used to distinguish acetophenone from benzophenone is (are)

    Solutions

    The structures of acetophenone and benzophenone are . When acetophenone containing is treated with l2​ and Na2​CO3​ it forms yellow precipitate of CHI3​ whereas benzophenone does not give this test. Acetophenons gives iodoform test due to presence of'-COCH3 group.

     

  • Question 6/10
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    Paraldehyde is used as a:

    Solutions

    Uses for paraldehyde: medicinal use

    Paraldehyde is used to treat certain convulsive disorders. It also has been used in the treatment ofalcoholism and in the treatment of nervous and mental conditions to calm or relax patients who are nervous or tense and to produce sleep.

     

  • Question 7/10
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    Predict the product 'B' in the sequence of reaction

    Solutions

     

  • Question 8/10
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    Propanal on reaction with dilute sodium hydroxide forms:

    Solutions

    It is an example of aldol condensation. Propanal on reaction with dilute sodium hydroxide forms CH3​CH2​CH(OH)CH(CH3​)CHO (3-hydroxy-2-methylpentanal).

     

  • Question 9/10
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    Ketones react with Mg−Hg over water gives:

    Solutions

     

  • Question 10/10
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    Which of the following reagents is used to distinguish acetone and acetophenone?

    Solutions

    acetophenone being aromatic ketone does not form adduct with NaHCO3 whereas acetone does

     

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