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Aldehydes and Ketones Quiz-7

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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. Schiff’s reagent is:
  •  Magenta solution decolourised with sulphurous acid
  •  Magenta solution decolourised with chlorine
  •  Ammoniacal cobalt chloride solution
  •  Ammoniacal manganese sulphate solution
Solution
Magenta is rosaniline hydrochloride which is decolourised byto give Schiff’s reagent.

Q2.Aldehydes can be oxidised by
  •  Tollen’s reagent
  •  Fehling solution
  •  Benedict solution
  •  All of these
Solution
Aldehydes are strong oxidising agents. They oxidise Tollen’s reagent (ammoniacalto Ag), Fehling solution (to)and Benedict solution (to). The reactions are used to detect the presence of aldehyde group in compound.

Q3.  
The name of the reaction and reagent used for it is
  •   Cannizaro reaction,
  •  Aldon condensation, 
  •  Tischenko reaction,
  •  Perkin reaction, 
Solution

Q4. Acetals are:
  •  Aldehyde
  •  Diethers
  •  Ketones
  •  Hydroxy aldehydes
Solution
Hydroxy aldehydes

Q5.
Identify Z in the sequence
  •  
  •  
  •  
  •  
Solution


Q6. What is the end product in the following sequences of operations;
  •  
  •  
  •  
  •  
Solution


Q7.A compound (A) (molecular formula –) on treatment withgives B
and C rearrange to give D and E respective on treatment with acid. B,C,D and E are all isomers of
molecular formula (). When D is boiled with the alcoholic KOH, an oil F ()
separates out. F reacts rapidly withto give back D. On the other hand, E on boiling with
alkali followed by acidification gives a white solid G(). Identify A
  •  
  •  
  •  
  •  
Solution
The compound is acetophenone


Q8.Which of following reactions convert acetone into hydrocarbon having same number of carbon
atoms?
  •  Wolff-Kishner reaction
  •  Hofmann reaction
  •  Grignard reaction
  •  Reduction with LAH
Solution


In Wolff-Kishner reduction carbonyl compounds are reduced to alkanes by usingand KOH/glycol.

Q9.Malonic acid and succinic acid are distinguished by:
  •  Heating 
  •  
  •  Both (a) and (b)
  •  None of these
Solution
Heating

Q10. A liquid was mixed with ethanol and a drop of concentratedwas added. A compound with a fruity smell was formed. The liquid was
  •  
  •  
  •  
  •  
Solution

Fruity smell is the characteristic property of ester, thus reaction can be considered as follows

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