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Aldehydes and Ketones Quiz-11

Dear Readers,

The one subject in NEET which is candidates who can easily attain good marks is Chemistry. That's the reason, often, one doesn’t pay notice and choose to compromise it. But if one wants to rank above others, the tip is to be thorough with NEET chemistry concepts. The understanding of reactions and definite basic understanding is what requires major attention in Chemistry but once done it only gets simpler from there. The main focus on the to-do list should be on getting a hang of the NCERT syllabus of NEET chemistry. .

Q1. The product obtained in the reaction
        

  •  

  •  

  •  

  •  There is no reaction
Solution:
Iso-propyl magnesium bromide reduces di-iso-propyl ketone to secondary alcohol. However, only –H^+ ion adds to ketone in spite of bulky alkyl group due to steric hinderance .













Q2.

      The structure of compound B is
  •  

  •  

  •  

  •  



Solution


Q3.   Main product of the reaction , CH 3CONH2+HNO2⟶..... is :
  •  CH3 COOH
  •  CH3 CH2 NH2
  •  CH3 NH2
  •  CH3 COONH4
Solution:
CH3COOH+H2O+N_2; the function of HNO2 is to convert — NH2gp. to —OH gp.


Q4. Self condensation of acetaldehyde, in the presence of dilute alkalies gives
  •  An acetal
  •  An aldol
  •  Mesitylene
  •  Propionaldehyde
Solution


The self condensation of acetaldehyde in presence of dilute alkalies is called aldol condensation and the product is known as aldol.





Q5. Acetaldehyde on oxidation with SeO2 gives:
  •  CH3 COOH
  •  C2 H5 OH
  •  CHO∙CHO
  •  None of these
Solution
 



Q6. (CH3 )2 C=CHCOCH3 can be oxidised to (CH3 )2C=CHCOOH by:
  •  Cu at 300℃
  •  KMNO4
  •  Chromic Acid
  •  NaOI
Solution
Unsaturated ketones may be converted to unsaturated acids by sodium hypohalite, i.e., NaOCl, NaOI, etc.

Q7.In the preparation of an ester the commonly used dehydrating agent is:
  •  Phosphorus pentoxide
  •  Anhydrous calcium chloride
  •  Anhydrous aluminium chloride
  •  Concentrated sulphuric acid
Solution
H2 SO4 acts as protonating (catalyst) agent as well as dehydrating agent

Q8.The conversion of benzaldehyde into benzyl alcohol takes place by
  •  Fittig reaction
  •  Wurtz Fitting reaction
  •  Wurtz reaction
  •  Cannizaro’s reaction
Solution
Cannizaro reaction aldehydes which does not have α-hydrogen atom undergo disproporation reaction (half of the molecule are oxidised and half are reduced). 


 ∴Benzaldehyde is converted into benzyl alcohol by Cannizaro reaction.

Q9.Which of the following is correct?
  •  All aldehydes undergo Cannizzaro’s reaction
  •  Aldehydes are less susceptible to oxidation than ketones
  •  Aldehydes are more susceptible to oxidation than ketones
  •  Formaldehyde forms CH2 (OH)NH2 NH3
Solution
Aldehydes are easily oxidised to respective acids

Q10. Prior to the seventeenth century people knew the processes except:
  •  Dyeing
  •  Preparation of wines
  •  Oragnic Synthesis
  • Fermentation
Solution
Oragnic Synthesis.

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Quiz-11 Aldehydes and Ketones
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