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12th Grade > Chemistry

ALDEHYDES AND KETONES MCQs

Total Questions : 30 | Page 1 of 3 pages
Question 1. Which of the following has the most acidic hydrogen? 
 
  1.    3-Hexanone
  2.    2,4-Hexanedione
  3.    2,5-Hexanedione
  4.    2,3-Hexanedione
 Discuss Question
Answer: Option B. -> 2,4-Hexanedione
:
B
(a)
Which Of The Following Has The Most Acidic Hydrogen?  
(b)
Which Of The Following Has The Most Acidic Hydrogen?  
(c)
Which Of The Following Has The Most Acidic Hydrogen?  
(d)
Which Of The Following Has The Most Acidic Hydrogen?  
Here, (b) has most acidic hydrogen. Since in (b), C-3 is directly attached with two EWG (C=O) groups which make hydrogens at C-3 most acidic.
Question 2. This Polymer Is Obtained When Acetone Is Saturated With Hyd... This polymer is obtained when acetone is saturated with hydrogen chloride gas. Polymer is:
  1.    phorone
  2.    formose
  3.    diacetonyl alcohol
  4.    mesityl oxide
 Discuss Question
Answer: Option A. -> phorone
:
A
The product formed by the shown condensation reaction is called Phorone.
Question 3. Oppenauer oxidation is the reverse process of:
  1.    Wolff-Kishner’s reduction
  2.    Rosenmund’s reduction       
  3.    Clemmensen’s reduction
  4.    Meerwein-Ponndorf Verley reduction
 Discuss Question
Answer: Option D. -> Meerwein-Ponndorf Verley reduction
:
D
OPPENAUER OXIDATION & MEERWIN-PONDORFF-VERLEY REDUCTION
Oppenauer Oxidation Is The Reverse Process Of:
Question 4. HCHO and HCOOH are distinguished by treating with:
  1.    Tollen’s reagent
  2.    NaHCO3
  3.    Fehling’s solution
  4.    Benedict solution
 Discuss Question
Answer: Option B. -> NaHCO3
:
B
HCOOH reacts with NaHCO3 producing effervescence of CO2 but not HCHO.
Question 5. A ketone reacted with C2H5MgBr reagent followed by hydrolysis gave a product which on dehydration gives an alkene. The alkene on ozonolysis gave diethyl ketone and acetaldehyde. The ketone is:
  1.    dimethyl ketone
  2.    ethyl methyl ketone
  3.    diethyl ketone
  4.    ethyl propyl ketone
 Discuss Question
Answer: Option C. -> diethyl ketone
:
C
A Ketone Reacted With C2H5MgBr Reagent Followed By Hydrolysi...
Question 6. CH3COOEt CH3MgBr−−−−−−→ExcessP
 Discuss Question
Answer: Option C. -> diethyl ketone
:
A
CH3COOEt CH3MgBr−−−−−−→ExcessP
Question 7. One mole of an organic compound requires 0.5 mole of oxygen to produce an acid. The compound may be:
  1.    alcohol
  2.    ether
  3.    ketone
  4.    aldehyde
 Discuss Question
Answer: Option D. -> aldehyde
:
D
CH3CHO+(O)→CH3COOH
Question 8. The difference between aldol condensation and Cannizzaro’s reaction is that:
  1.    the former takes place in the presence of α-H-atom               
  2.    the former takes place in the absence of α−H−atom
  3.    the former takes place in the presence of β−H−atom
  4.    none of the above
 Discuss Question
Answer: Option A. -> the former takes place in the presence of α-H-atom               
:
A
Aldol condensation occurs in presence of α-hydrogens but cannizzaro’s reaction occurs in the absence of α−hydrogens.
The Difference Between Aldol Condensation And Cannizzaro’s...
The Difference Between Aldol Condensation And Cannizzaro’s...
Question 9. The decreasing order of solubility of methanal (A), propanaldehyde (B), benzaldehyde (C) and acetophenone (D):
  1.    A>B>C>D
  2.    D>C>B>A
  3.    D>A>B>C
  4.    B>A>C>D
 Discuss Question
Answer: Option A. -> A>B>C>D
:
A
Solubility decreases due to increase in molecular weight as a result of increase in hydrophobic nature of the alkyl group.
Question 10. Predict the productPredict The Product
 Discuss Question
Answer: Option A. -> A>B>C>D
:
B
Predict The Product

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