12th Class Chemistry Mcqs With Answers Chapter 12| 2nd Year chemistry mcqs with answers pdf

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12th Class Chemistry Mcqs With Answers Chapter 1


Chapter No 12

Aldehydes & Ketones

1. Mild oxidizing agent among the following is choose which one is correct:

  1. K2Cr2O7 (acidified)
  2. KMnO4 (alkaline)
  3. Ammoniacal AgNO3
  4. All of above

2. C = O and C = C bonds are differentiated by choose which one is correct:

  1. Hybridization of C-atom
  2. Planar structures
  3. Bond length
  4. Undergo addition reaction

3. Reactivity of carbonyl compounds is due to choose which one is correct:

  1. Electrophilic carbon
  2. Less stearic hindrance
  3. Unsaturation of C = O
  4. All of above

4. For the preparation of CH3CHO from calcium acetate we need choose which one is correct:

  1. 2 molecules of Ca(CH3COO)2
  2. 1 mole of Ca(CH3COO)2 and 1 molecule of Ca(HCOO)2
  3. 2 molecules of Ca(HCOO)2
  4. None of these

5. Which is a mixed ketone choose which one is correct:

  1. Acetone
  2. Benzophenone
  3. Diethyl ketone
  4. Acetophenone

6. Which of the following can produce ketone choose which one is correct:

  1. Sec-alcohol
  2. Calcium acetate
  3. Propyne
  4. All of above

7. Which of the following is resistant to oxidation under normal condition choose which one is correct:

  1. CH3OH
  2. C2H5OH
  3. CH3CHO
  4. CH3COCH3

8. Which of the following aldehyde is most reactive choose which one is correct:

  1. HCHO
  2. CH3CHO
  3. C6H5CHO
  4. All of above

9. Ketones are prepared by the oxidation of choose which one is correct:

  1. P° alcohol
  2. S° alcohol
  3. T° alcohol
  4. None of these

10. Which of the following does not give cannizzaro reaction choose which one is correct:

  1. Formaldehyde
  2. Acetaldehyde
  3. Benzaldehyde
  4. None of above

11. Ethanal has ⎯⎯⎯⎯ sigma bonds choose which one is correct:

  1. 5
  2. 6
  3. 7
  4. 8

12. Which of the following compounds is acetophenone choose which one is correct:

  1. C6H5COCH3
  2. C6H5COC6H5
  3. CH3COCH3
  4. C6H5CHO

13. Which of the following tests is shown by ketones choose which one is correct:

  1. Fehling solution test
  2. Tollens reagenz test
  3. Schiff’s reagent test
  4. Sodium nitroprusside test

14. Which of the following will undergo nucleophilic addition reaction more  easily choose which one is correct:

  1. Aldehyde
  2. Alkene
  3. Aldehyde and ketone
  4. All of these

15. Which of the following aldehdyes is used to prepare urotropine medicine choose which one is correct:

  1. Acetaldehyde
  2. Acetone
  3. Formaldehyde
  4. Ethyl alcohol

16. In which of the following compounds, carbon number is decreased during  the oxidation choose which one is correct:

  1. Aldehyde
  2. Ketone
  3. Alcohol
  4. Ether

17. Which of the following is used as ink preservative choose which one is correct:

  1. Alcohol
  2. Aldehyde
  3. Ether
  4. Phenol

18. Which one of the following compounds is not derivative of NH3 choose which one is correct:

  1. Aniline
  2. Hydrazine
  3. Phenyl hydrazine
  4. Picric acid

19. Aldol compound consists of choose which one is correct:

  1. Aldehyde group
  2. Hydroxyl group
  3. Carboxylic group
  4. Both A.  and (b)

20. Which one of the following is the strongest reducing agent choose which one is correct:

  1. C3H8
  2. CH2O
  3. C3H7OH
  4. CH3COCH3

21. When aldehyde reacts with Tollen’s reagent choose which one is correct:

  1. A ketone is produced
  2. An alcohol is produced
  3. Ag+ions are produced
  4. Ag+ions are reduced

22. Which of the following reagents will react with both aldehydes and Ketones?

  1. Grignard reagent
  2. Tollen’s reagent
  3. Fehling’s reagent
  4. Sodium nitroprusside

23. Cannizzaro’s reaction is not given by choose which one is correct:

  1. Formaldehyde
  2. Acetaldehyde
  3. Benzaldehyde
  4. Trichloro acetaldehyde

24. Which of the following compounds will not give iodoform test on treatment  with I2/NaOH choose which one is correct:

  1. Acetaldehyde
  2. Acetone
  3. 2-butanone
  4. 3-pentanone

25. Aldehyde and ketone have higher boiling point than corresponding  compounds of the following except choose which one is correct:

  1. Alkanes
  2. Alkenes
  3. Ethers
  4. Alcohols

26. The hybridization of C-atom in carbonyl group is choose which one is correct:

  1. sp
  2. sp2
  3. Sp3
  4. dsp2

27. Cyanohydrins are formed from carbonyl compounds by ⎯⎯⎯⎯ reactions  mechanism choose which one is correct:

  1. Free radical
  2. Nucleophilic substituion
  3. Nucleophilic addition
  4. Electrophilic addition

28. The red brown ppt. of Fehling solution and Benedict solution tests are of choose which one is correct:

  1. Ag
  2. CuO
  3. Cu2O
  4. AgBr

29. Carbonyl compounds react with hydroxyl amine (NH2OH) to form choose which one is correct:

  1. Hydrazone
  2. Oxime
  3. Cyanohydrin
  4. Bisulphite addition product

30. Paraldehyde is polymer of choose which one is correct:

  1. HCHO
  2. CH3CHO
  3. CH3COCH3
  4. CH3CH2CH2OH

31. Paraldehyde is used as a choose which one is correct:

  1. Medicine
  2. Poison
  3. Dye
  4. Polymer

32. Calcium formate Ca(HCOO)2 on dry heating yields choose which one is correct:

  1. HCHO
  2. CH3CHO
  3. CH3COCH3
  4. CH3COOH  

33. Aldehydes combine with alcohol in presence of hydrogen chloride gas to form choose which one is correct:

  1. Alkane
  2. Acetal
  3. Carboxylic acid
  4. Ketones

34. Which of the following is not a use of formaldehyde choose which one is correct:

  1. Manufacture of dyes
  2. Silvering of mirror
  3. Making formamint
  4. Antiseptic inhalent

35. Which of the following test is not given by aldehyde choose which one is correct:

  1. 2, 4 DNPH test
  2. NaHSO3 test
  3. Tollen’s test
  4. Sodium nitroprusside test

36. Ketones on reduction produce choose which one is correct:

  1. P° alcohol
  2. S° alcohol
  3. T° alcohol
  4. None

37. Which is not true about Cannizzaro’s reaction choose which one is correct:

  1. Self oxidation reduction
  2. Concentrated NaOH
  3. Disproportionation reaction
  4. Dilute NaOH

38. Aldehyde give precipitate with Fehling solution on choose which one is correct:

  1. Cooling
  2. Heating
  3. Boiling
  4. Do not give ppt.

39. Which of the following compound is least reactive choose which one is correct:

  1. HCHO
  2. CH3CHO
  3. CH3COCH3
  4. C6H5CHO

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