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Aldehydes and Ketones Quiz-15

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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. Lemon is sour due to:
  •  Citric acid
  •  Tartaric acid
  •  Oxalic acid
  •  Acetic acid
Solution


Q2.Which of the following statements is correct about a carbonyl group?
  •  The carbonyl carbon is sp-hybridised
  •  The carbonyl carbon is sp3-hybridised
  •  The three groups attached to the carbonyl carbon lie in the same plane
  •  The three groups attached to the carbonyl carbon lie in different planes
Solution
In the carbonyl group, carbon atom is in a state of sp2 hybridisation. One sp2 hybrid orbital overlap with a unhydridised p-orbital of oxygen to form C-O σ-bonds. The remaining two sp2 orbitals of carbon from σ-bonds with s-orbitals of hydrogen or sp3-orbitals of carbon of the alkyl groups. The C-O π-bond is formed by the sideways overlap of p-orbitals of carbon and oxygen. Thus, the three σ-bonds of carbonyl carbon lie in one plane and are 120° apart.



Q3.   Alkaline hydrolysis of an ester is called:
  •  Neutralization
  •  Esterification
  •  Polymerization
  •  Saponification
Solution



Q4. 

  •  

  •  

  •  

  •  

Solution



Q5. The strongest acid amongst the following compound is:
  •  CH3COOH
  •  HCOOH
  •  CH3 CH2 CH(Cl)COOH
  •  ClCH2 CH2 CH2 COOH
Solution
 α-chloro butyric acid is more stronger than others due to –I effect of Cl-.

Q6. Sodium salt of formic acid on strong heating followed by acid hydrolysis yields:
  •  HCHO
  •  HCOOH
  •  COOH—COOH
  •  CH3 CHO
Solution


Q7.In which of the below reaction do we find α,β- unsaturated carbonyl compounds undergoing a ring closure reaction with conjugated dienes?
  •  Perkin reaction
  •  Diels-Alder reaction
  •  Claisen rearrangement
  •  Hofmann reaction
Solution
The addition of α,β-unsaturated carbonyl compound, with conjugated diene is called Diel’s-Alder reaction.

Q8.The enol form of acetone, after treatment with D2O gives
  •  

  •  



  •  

  •  

Solution


After treatment with D2O,the H+ion of-OH group is replaced by D+ion, because of being more reactive than deuterium.




Q9. The formula of a compound which gives simple whole number atomic ratio in one molecule of a compound is called:
  •  Structure formula
  •  Molecular formula
  •  Empirical formula
  •  Projection formula
Solution
Molecular formula = integer × empirical formula

Q10. Coal-tar is obtained as by product during :
  •   Destructive distillation of wood
  •  Destructive distillation of coal
  •  Destructive distillation of bones
  •  None of the above
Solution

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Quiz-15 Aldehydes and Ketones
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