Learn chemistry 12 imp mcqs chapter 12 pdf. these are chemistry 12 important mcqs from past papers for both Entry Test and Board Exams.
IMPORTANCE OF THESE MCQS
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must have proper preparation of 2nd year chemistry mcqs for excellent
marks in chemistry 12. All the important mcqs related to chapter 12 aldehydes and ketones of 2nd
year Chemistry are here for you. These questions are taken from past
papers of chemistry 12 of all Punjab Board of Pakistan as ;
Bahawalpur Board
D.G.Khan Board
Faisalabad Board
Gujranwala Board
Lahore Board
Multan Board
Rawalpindi Board
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About This Chapter
Chapter no. 12 "Aldehydes and ketones" of chemistry 12 enables the students to name aldehydes and ketones. Students learn preparation of aldehydes and ketones. Students learn methods of preparation of formaldehyde and acetaldehyde. Students learn identification of aldehydes and ketones. Students learn to distinct aldehydes and ketones. This "Chemistry 12 imp mcqs chapter 12 Preview or download" covers all important mcqs that are top repetitive
in past papers relevant to above mentioned topics.
👉For Answers of following questions click the show answer button.
1. Ketones are prepared by the oxidation of
(A) Primary alcohol
(B) Secondary alcohol
(C) Tertiary Alcohol
(D) None of these
(B) Secondary alcohol
2. The carbon atom of carbonyl group is hybridized?
(A) sp
(B) sp2
(C) sp3
(D) dsp2
B) sp2
3. Formalin is a 40% solution of ____ in water.
(A) CH3CHO
(B) CH3OH
(C) HCHO
(D) CH3OCH
(C) HCHO
4. Cannizzaro reaction is given by
(A) Acetaldehyde
(B) Propanone
(C) Propanal
(D) Formaldehyde
(D) Formaldehyde
5. Which reagent will react with both aldehyde and ketones?
(A) Grignard's reagent
(B) Fehling's reagent
(C) Tollens's reagent
(D) Benedict's reagent
(A) Grignard's reagent
6. Aldol condensation is given by
(A) Acetaldehyde
(B) Benzaldehyde
(C) Formaldehyde
(D) All of above
(A) Acetaldehyde
7. Which reaction is a disproportionation reaction?
(A) Aldol condensation
(B) Cannizzaro reaction
(C) Haloform reaction
(D) All of above
(B) Cannizzaro reaction
8. Silver mirror test is given by
(A) Ethers
(B) Ketones
(C) Acids
(D) Aldehydes
(D) Aldehydes
9. Which of the following has highest boiling point?
(A) Methanol
(B) Ethanol
(C) Propanol
(D) 2-Hexanone
(C) Propanol
10. Ketones are prepared by the oxidation of
(A) Primary alcohol
(B) Secondary alcohol
(C) Tertiary alcohol
(D) None of these
(B) Secondary alcohol
11. Acetone reacts with HCN to form a cyanohydrin. It is an example of
(A) Electrophilic Addition
(B) Electrophilic Substitution
(C) Nucleophilic Addition
(D) Nucleophilic Substitution
(C) Nucleophilic Addition
12. Which of the following compound will not give iodoform test on treatment with I2/NaOH?
(A) Acetaldehyde
(B) Acetone
(C) Butanone
(D) 3-Pentanone
(D) 3-Pentanone
13. Aldehydes are the first oxidation product of :
(A) Primary alcohol
(B) Secondary alcohol
(C) Tertiary alcohol
(D) All of above
(A) Primary alcohol
14. Formaldehydes give ____ test with Tollens's reagent.
(A) Benedict's test
(B) Lucas test
(C) Silver Mirror test
(D) None of these
(C) Silver Mirror test
15. Acetaldehyde gives a ___ precipitate with Fehling's solution.
(A) Silver
(B) Grayish
(C) Brick Red
(D) Greenish
(C) Brick Red
16. The general formula of aldehydes is:
(A) CnH2nO
(B) CnH2n
(C) CnH2nOH
(D) CnH2n+2
(A) CnH2nO
17. Calcium formate on heating gives
(A) Formaldehyde
(B) Acetaldehyde
(C) Formic Acid
(D) Methane
(C) Formic Acid
18. Trimer of formaldehyde is known as:
(A) Trioxane
(B) Formic acid
(C) Trioxymethylene
(D) Meta formaldehyde
(D) Meta formaldehyde
19. Aldehydes are ----- agents.
(A) Oxidizing
(B) Reducing
(C) Bleaching
(D) Hydrating
(B) Reducing
20. Tollens's reagent is :
(A) Alkaline KMnO4
(B) Ammonical AgNO3
(C) Acidified AgNO3
(D) Ammonical Cu2Cl2
(B) Ammonical AgNO3
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