Quiz-13 Aldehydes and Ketones

Aldehydes and Ketones Quiz-13

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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.  The splitting of an ester by an alcohol is known as

•  Acidolysis
•  Alcoholysis
•  Ammonolysis
•  Hydrolysis

Solution
CH₃ COOCH₃+C₂ H₅OH⟶CH₃ COOC₂ H₅+CH₃OH

Q2.Etard’s reaction involves the preparation of benzaldehyde from

•  Toluene
•  Ethyl benzene
•  Benzoyl chloride
•  Sodium benzoate

Solution

Toluene can be oxidized to benzaldehyde with a solution of chromyl chloride (CrO₂ Cl₂ ) in CS₂ or CCl₄This is known as Etard reaction. Further oxidation of benzaldehyde to benzoic acid is avoided by protection of carbonyl group.

Q3.   Identify the product Z in the series,

•  CH₃CHO
•  CH₃ CH₂ CONH₂
•  CH₃COOH
•  CH₃ CH₂ NHOH

Solution

Q4. Which of the following regent can effectively carried out the following conversion?

•  LiAlH₄
•  NaBH₄
•  H₂/Pd-C
•  H₂/Raney Ni

Solution

NaBH₄ is a mild reducing agent and can not reduce less reactive ester group

Q5. Which product is obtained on reduction of methanal in the presence of concentrated NaOH?

•  Formic acid and methyl alcohol
•  CO+H_2
•  Methyl alcohol
•  Formic acid

Solution
 

 

 Thus, reaction is called Cannizaro’s reaction.

Q6. The Sulphur present in an organic compound is oxidized by fuming nitric acid into:

•  SO₂
•  H₂ SO₄
• H₂ S
•  S

Solution

Q7.Identify X in the sequence:

•  
  
  
  
•  CH₃CH₂CH₂CHO
•  (CH₃)₂CHCHO
•  CH₃CH₂CH₂CH₂OH

Solution
C₅ H₁₂O must be a tertiary alcohol as it gives alkene on treatment with Cu. Thus C₄ H₈O is a ketone.

Q8.Formaldehyde can be distinguished from acetaldehyde by the use of:

•  Schiff’s reagent
•  Tollen’s reagent
•  Fehling’s solution
•  NaOH and iodine

Solution
Formaldehyde does not give iodoform reaction.

Q9.Hydrated oxalic acid contains:

•  5 water molecules
•  1 water molecule
•  2 water molecules
•  4 water molecules

Solution
Hydrated oxalic acid is H₂ C₂ O₄∙2H₂ O

Q10. Tartronic acid is obtained from tartaric acid by:

•  HBr
•  HI
•  Tollen’s reagent
•  PCl₅

Solution