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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
12th Chemistry chapter 12 Bihar board with NCERT-Details & Highlights
| name of content | 12th Chemistry chapter 12 full solution |
| content | Chemistry objective type MCQ question with answer |
| name of subjects | class 12 Chemistry |
| important for exam | Bihar board & other state board |
| pattern & Level | NCERT & State level question |
12th Chemistry chapter 12 all objective solutions – download PDF
1. Differentiation between aldehyde and ketone can be done by which of the following?
-
- (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 Chemistry chapter 12 complete objective
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Bihar board 12th science stream subjects wise solution
click here to check out Bihar board science stream all subjects solutions
| SL.N. | Subject name with solutions |
| 01 | Physics |
| 02 | Chemistry |
| 03 | Biology |
| 04 | Math |
| 05 | Hindi |
| 06 | English |
