12th Chemistry chapter 12: full solution, notes, MCQ, & free PDF | Bihar board

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12th Chemistry chapter 12: cover all important question with new latest pattern. you can download Chemistry chapter 12 notes & full solution as PDF format in English. below we are goin to cover chapter 12 Chemistry class 12 Bihar board
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12th Chemistry chapter 12 Bihar board with NCERT-Details & Highlights

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name of subjects  class 12 Chemistry
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12th Chemistry chapter 12 all objective solutions – download PDF

1. Differentiation between aldehyde and ketone can be done by which of the following?

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    • (A) Concentrate H , SOA
    • (B) Hydrazine
    • (C) Schiff reagent
    • (D) Nitrous acid
 Answer: (C) Schiff reagent
2. Formaldehyde is obtained on heating with NaOH solution.
    • (A) formic acid
    • (B) acetone
    • (C) Methyl alcohol
    • (D) Ethyl formate
 Answer: (C) Methyl alcohol
3. On heating a mixture of calcium acetate and calcium formate is formed
    • (A) Methanol
    • (B) Ethanol
    • (C) acetic acid
    • (D) Ethanal
 Answer: (D) Ethanal
4. Calcium acetate is obtained by heating
    • (A) Ethyl Acetate
    • (B) calcium formate
    • (C) acetone
    • (D) Acetaldehyde
 Answer: (C) Acetone
5. Which of the following can differentiate between aldehyde and ketone?
    • (A) Fehling’s solution
    • (B) Caustic Soda
    • (C) Nignard reagent
    • (D) none of these
 Answer: (A) Fehling solution
 6. Who among the following gives iodoform test?
    • ( A ) C , H , OH
    • ( B ) CH OH
    • (C) HCHO
    • ( D ) C , H ,
 Answer: (A) C, H, OH
7. Oxidation of which of the following gives acetone?
    • ( A ) PAY FOR
    • ( B ) CH..OH
    • (C) CHI CHOH. WHO
    • ( D ) CH , OH
 Answer: (C) CHI CHOH. CHI
 8. Acetaldehyde reacts with chlorine to form
    • (A) Acetyl chloride –
    • (B) Silver
    • (C) Dichloroacetic acid
    • (D) none of these
 Answer: (B) Silver
9. Acetaldehyde is formed on heating with ammonia-mixed silver nitrate
    • (A) Acetone
    • (B) Silver Acetate
    • (C) Silver – Mirror
    • (D) Formaldehyde
 Answer: (C) Silver – Mirror
10. On heating formic acid with ammonia-mixed silver nitrate solution, it is formed
    • (A) red precipitate
    • (B) white precipitate
    • (C) Silver mirror
    • (D) none of these
Answer: (B) White precipitate
11. Ammonium acetate is obtained on excessive heating.
    • (A) Urea
    • (B) acetic acid
    • (C) Acetamide
    • (D) Ethylamine
 Answer: (C) Acetamide

Bihar Board 12th chemistry chapter 12 most mcq solution

 12. Which reagent can be used to differentiate between formic acid and acetic acid?
    • (A) Methyl
    • (B) And
    • (C) Tollens reagent
    • (D) Grignard reagent
 Answer: (D) Grignard reagent
13. When propanoic acid is heated with aqueous Na , co 2 , the ‘ C ‘ of co 2 is obtained
    • (A) methyl group
    • (B) carboxylic acid group
    • (C) from methylene group
    • (D) bicarbonate
Answer: (D) Bicarbonate
14. Which of the following does not reduce Fehling’s solution?
    • (A) formic acid
    • (B) acetic acid
    • (C) Formaldehyde
    • (D) Acetaldehyde
Answer: (B) Acetic acid
15. The reaction of ethyl formate in excess of CH, MgBr and hydrolysis is obtained by
    • (A) n-propyl alcohol
    • (B) Ethanal
    • (C) propanol
    • (D) isopropyl alcohol
Answer: (D) isopropyl alcohol
16. Difference between formic acid and acetic acid. can be done by
    • (A) with sodium
    • (B) with mercuric chloride
    • (C) 2, 4 – with dinitrophenylhydrazine
    • (D) with sodium ethoxide
Answer: (B) With mercuric chloride
17. An ester is heated with KOH and the solution obtained is cooled and acidified. As a result a white precipitate is obtained, then which of the following is an ester?
    • (A) Methyl acetate
    • (B) Ethyl Acetate
    • (C) Ethyl formate
    • (D) Ethyl Benzoate
Answer: (D) with mercuric chloride
18. An organic compound reacts with a saturated aqueous solution of NaHCO, which causes swelling. Which of the following would be that compound?
    • (A) Alkane
    • (B) alkene
    • (C) acetic acid
    • (D) ethyl alcohol
 Answer: (C) Acetic acid
19. What type of reaction does aldehyde and ketone show with LIAIH2 and NaBH2?
    • (A) Kendra Snehi Yogashil
    • (B) Solution
    • (C) Nucleus friendly replacement
    • (D) Electron friendly replacement
 Ans: (A) Kendra Snehi Yogashil
20. By what reaction will benzyl alcohol be formed from benzaldehyde?
    • (A) Wurz reaction
    • (B) Perkin reaction
    • (C) Cannizzaro reaction
    • (D) Klaijn reaction
 Answer: (C) Cannizzaro reaction
21. Acetamide (CHCONH.) reacts with NaOBr in alkaline medium.
  • ( A ) NH3
  • ( B ) CH , NH2
  • ( C ) CHICN
  • ( D ) CH CH NH2
Answer: (B) CH, NH2
22. Which of the following will not show Cannizzaro reaction?
    • (A) Trimethyl acetaldehyde
    • (B) Acetaldehyde
    • (C) Formaldehyde
    • (D) Benzaldehyde
Answer: (B) Acetaldehyde
23. The reagents in Cannizzaro reaction and aldol condensation are respectively
    • (A) dilute NaOH and concentrated NaOH
    • (B) concentrated NaOH and dilute NaOH
    • (C) NaOH and NaCl
    • (D) Nal + NaOI
 Answer: (B) Concentrated NaOH and Dilute NaOH

BSEB 12th chemistry chapter 12 most important mcq notes 

24. The strongest acid among the following is
    • (A) p-chlorobenzoic acid
    • (B) p-hydroxy benzoic acid
    • (C) p-nitrobenzoic acid
    • (D) Benzoic acid
 Answer: (C) p-nitrobenzoic acid
25. Acetamide is
  • (A) indifferent
  • (B) amphoteric
  • (C) slightly acidic
  • (D) low alkaline
 Answer: (B) Bipartisan
26. In which acid COOH group is not present,
    • (A) picric acid
    • (B) acetic acid
    • (C) lactic acid
    • (D) formic acid
 Answer: (A) Picric acid
 27. By which reagent is methyl ketone identified?
    • (A) Tollens reagent
    • (B) Iodoform Test
    • (C) Swiff’s test
    • (D) Fehling’s solution
 Answer: (B) Iodoform test
28. Which statement is true for the enolic form of ketone?
    • (A) 70 , 21 , 2 loan pairs
    • (B) 9-6, 17-bandh, 2 lone pair
    • (C) 80, three
    • ( D ) 106 , two
Answer: (B) 9-6, 17-bandh, 2 loan pairs
29. The combustion of which of the following forms benzaldehyde?
    • (A) Benzyl alcohol
    • (B) Benzotrichloride
    • (C) Benzylchloride
    • (D) Benzonitrile
Answer: (C) Benzalchloride
30. Used to make mirrors
    • (A) Aldehyde
    • (B) Alkol
    • (C) Carboxylic acid
    • (D) Chloroform
Answer: (A) Aldehyde
31. The aqueous solution of which of the following carbonyl compound is used to preserve biological samples?
    • (A) FACT
    • (B) CHICHO
    • ( C ) CH.COCHI
    • ( D ) .CH , FOR
Answer: (A) HCHO
32. Pyruvic acid (CH.COCOOH) will be obtained from the oxidation of which of the following?
    • (A) Acetaldehyde cyanohydrin
    • (B) Formaldehyde Cyanohydrin
    • (C) acetone cyanohydrin
    • (D) none of these
 Answer: (D) none of these
33. Which of the following gets oxidised in the presence of light and air?
    • (A) FACT
    • ( B ) CH.COCH ,
    • (C) CHICHO
    • (D) CHCHO
 Answer: (D) CHCHO
34. Which one can react with alcoholic KCN?
    • ( A ) CH , cocl
    • ( B ) C2H6 .
    • (C) C 6 H, CT
    • ( D ) CH , CHOP
 Answer: (C) C6H, CT
35. In which reaction is the catalyst SnCI/HCI used?
    • (A) Stephens
    • (B) Cannizzaro
    • (C) Rosenmund
    • (D) none of these
 Answer: (A) Stephens
36. The suitable reagent for estimating Easter is
    • (A) NHROH
    • ( B ) NH2 – NH2
    • ( C ) Na2SO3
    • ( D ) CH , CHOP
 Answer: (A) NHROH

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Bihar board 12th science stream subjects wise solution

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01 Physics
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03 Biology
04 Math
05 Hindi
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