Class 12 Aldehyde Ketone and Carboxylic Acid MCQ Questions are one of the best strategies to prepare for the CBSE Class 12 Board exam. If you want to complete a grasp concept or work on one’s score, there is no method except constant practice. Students can improve their speed and accuracy by doing more MCQ on Aldehydes Ketones and Carboxylic acids class 12 which will help them all through their board test.
Class 12 Aldehyde Ketone and Carboxylic Acid MCQ Questions with Answers
Class 12 Chemistry MCQ with answers are given here to chapter the Aldehyde Ketone and Carboxylic Acid . These MCQs are based on the latest CBSE board syllabus and relate to the latest Class 12 Chemistry syllabus. By Solving these Class 12 MCQ, you will be able to analyze all of the concepts quickly in the chapter and get ready for the Class 12 Annual exam.
Learn Class 12 Chemistry Aldehydes Ketones and Carboxylic Acids MCQ with answers pdf free download according to the latest CBSE and NCERT syllabus. Students should prepare for the examination by solving CBSE Class 12 Aldehyde Ketone and Carboxylic Acid MCQ with answers given below.
Question 1. Ketones [RCOR1] where R = R1 = alkyl group. It can be obtained in one step by
(a) oxidation of tertiary alcohol
(b) reaction of acid halide with alcohols
(c) hydrolysis of esters
(d) oxidation of primary alcohol.
Question 2.Which one of the following can be oxidised to the corresponding carbonyl compound?
Question 3. In the reaction, CH3CN + 2H → HCl Ether → X→ Boiling H2OY; the term Y is
Question 4. Which of the following reagents would distinguish cis-cyclopenta-1,2-diol from the trans-isomer?
(b) Aluminium isopropoxide
Question 5. The oxidation of toluene to benzaldehyde by chromyl chloride is called
(a) Etard reaction
(b) Riemer–Tiemann reaction
(c) Wurtz reaction
(d) Cannizzaro’s reaction.
Question 6. Reaction between benzaldehyde and acetophenone in presence of dilute NaOH is known as
(a) Aldol condensation
(b) Cannizzaro’s reaction
(c) Cross Cannizzaro’s reaction
(d) Cross Aldol condensation.
Question 7. CH3CHO and C6H5CH2CHO can be distinguished chemically by
(a) Benedict’s test
(b) iodoform test
(c) Tollens’ reagent test
(d) Fehling’s solution test.
Question 8. Consider the reaction : RCHO + NH2NH2 → RCH=N — NH2 What sort of reaction is it?
(a) Electrophilic addition-elimination reaction
(b) Free radical addition-elimination reaction
(c) Electrophilic substitution-elimination reaction
(d) Nucleophilic addition-elimination reaction
Question 9. Which of the following compounds will give a myellow precipitate with iodine and alkali?
(b) Methyl acetate
Question 10. The correct statement regarding a carbonyl compound with a hydrogen atom on its alphacarbon, is
(a) a carbonyl compound with a hydrogen atom on its alpha-carbon rapidly equilibrates with its corresponding enol and this process is known as carbonylation
(b) a carbonyl compound with a hydrogen atom on its alpha-carbon rapidly equilibrates with its corresponding enol and this process is known as keto-enol tautomerism
(c) a carbonyl compound with a hydrogen atom on its alpha-carbon never equilibrates with its corresponding enol
(d) a carbonyl compound with a hydrogen atom on its alpha-carbon rapidly equilibrates with its corresponding enol and this process is known as aldehyde-ketone equilibration
Question 11. The product formed by the reaction of an aldehyde with a primary amine is
(a) carboxylic acid
(b) aromatic acid
(c) Schiff ’s base
Question 12. Reaction of a carbonyl compound with one of the following reagents involves nucleophilic addition followed by elimination of water. The reagent is
(a) hydrazine in presence of feebly acidic solution
(b) hydrocyanic acid
(c) sodium hydrogen sulphite
(d) a Grignard reagent.
Question 13. A strong base can abstract an a-hydrogen from
Question 14. Reduction of aldehydes and ketones into hydrocarbons using zinc amalgam and conc. HCl is called
(a) Cope reduction
(b) Dow reduction
(c) Wolff–Kishner reduction
(d) Clemmensen reduction.
Question 15. Clemmensen reduction of a ketone is carried out in the presence of which of the following?
(a) Glycol with KOH
(b) Zn-Hg with HCl
(d) H2 and Pt as catalyst
Question 16. Which of the following reactions will not result in the formation of carbon-carbon bonds?
(a) Reimer–Tiemann reaction
(b) Cannizzaro reaction
(c) Wurtz reaction
(d) Friedel–Crafts acylation
Question 17. Which of the following can be used to differentiate between aldehyde and ketone?
(a) Ammoniacal AgNO3
(b) Ammoniacal AgNO3 in the presence oftartarate ion
(c) I2 in the presence of base
(d) Ammoniacal AgNO3 in the presence of citrate ion
Question 18. A compound X undergoes reduction with LiAIH4 to yield Y . When vapours of Yare passed over freshly reduced copper at 300° C, X is formed. What is Y?
Question 19. The product formed in the aldol condensation of acetaldehyde is
Question 20. The product formed in aldol condensation is A
(a) a beta-hydroxy aldehyde or a beta-hydroxy ketone
(b) an alpha-hydroxy aldehyde or ketone
(c) an alpha, beta unsaturated ester
(d) a beta-hydroxy acid.
Question 21. Aldo! condensation is given by
(a) trimethyl acetaldehyde
Question 22. Which of the following will form two isomers with semi carbazide ?
Question 23. In the reaction
CH3COOH →LiAIH4 A →PCl5 B →Ale.KOH C, the product C is
(d) acetyl chloride
Question 24. The reaction of an organic compound with ammonia followed by nitration of the product gives a powerful explosive, called RDX. The organic compound is
Question 25. Which of the following does not give Fehling solution test?
Question 26. Which of the product is formed when acetone is reacted with barium hydroxide solution?
Question 27. The correct increasing order of the acid strength ofbenzoic acid (I), 4-nitrobenzoic acid (II), 3, 4-dinitrobenzoic acid (III) and 4methoxybenzoic acid (IV) is
(a) I < II < III < IV
(b) II < I < IV < III
(c) IV < I < II < III
(d) IV < II < I < III
(e) I < IV < II < III
Question 28. Identify Din the following reaction
Question 29. A liquid was mixed with ethanol and a drop of concentrated H2SO4 was added. A compound with a fruity smell was formed. The liquid was
Question 30. 2-pentanone and 3-petanone can be distinguished by
(a) Cannizzaro’s reaction
(c) Iodoform reaction reduction
(b) Aldo! condensation
Question 31. Sodium phenoxide when heated with CO2 under pressure at 125°C yields a product which on acetylation producesC.
Question 32. Vinegar is dilute aqueous solution of
(a) ethanoic acid
(b) benzoic acid
(c) citric acid
(d) oxalic acid
Question 33. Which one of the following acid does not have a carboxylic group?
(a) Methanoic acid
(b) Ethanoic acid
(c) Propanoic acid
(d) Picric acid
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Question 34. What product is formed when cyclohexanone is oxidised?
(a) HOOC. (CH2)4 · COOH
(d) None of the above
Question 35. Identify the method by which Me3CCO2H can be prepared.
(a) Treating 1 mole of MeCO Me with 2 moles of MeMgI
(b) Treating 1 mole of MeCO2 Me with 3 moles of MeMgI
(c) Treating 1 mole of MeCHO with 3 moles of MeMgI
(d) Treating 1 mole of dry ice with 1 mole of Me3CMgI
(a) hydroxy nitrite
(b) hydroxy cyanide
(d) hydroxy isocyanide
Question 37. The compound that undergoes decarboxyliation most readily under mild condition is
Question 38. Among the following compounds, the one(s) that gives (give) effervescence with aqueous NaHCO3 solution is (are)
I II III IV
(a) I and II
(b) I and III
(c) Only II
(d) 1 and IV
Question 39. Which acid is present in vinegar?
(a) Formic acid
(b) Acetic acid
(c) Butyric acid
(d) Tartaric acid
Question 40. Which one of the following is an Hell-Volhard-Zelinsky reaction?
Question 41. The strongest acid amongst the following compounds is
Question 42. Benzaldehyde on refluxing with aqueous alcoholic KCN produce
(c) benzoyl cyanide
Question 43. Which of the following is incorrect?
(a) FeCl3 is used in detection of phenol.
(b) Fehling solution is used in detection of glucose.
(c) Tollens’ reagent is used in detection of unsaturation.
(d) NaHSO3 is used in detection of carbonyl compound.
Question 44. Polarisation in acrolein can be described as
(a) +δCH2=CH — +δCHO
(b) -δCH2= CH — +δCHO
(c) -δCH2= CH — CHO+δ
(d) +δCH= CH — CHO-δ
Question 45. A carbonyl compound reacts with hydrogen cyanide to form cyanohydrin which on hydrolysis forms a racemic mixture of a-hydroxy acid. The carbonyl compound is
(d) diethyl ketone.
Question 46. In this reaction : CH3CHO + HCN → CH3CH(OH)CN →HOH CH3CH(OH)COOH an asymmetric centre is generated. The acid obtained would be
(c) 50% D + 50% L-isomer
(d) 20% D + 80% L-isomer.
Question 47. Iodoform test is not given by
Question 48. Phenylmethanol can be prepared by reducing the benzaldehyde with
(a) CH3Br and Na
(b) CH3I and Mg
(d) Zn and HCl.
Question 49. The oxidation of toluene with CrO3 in the presence of (CH3CO)2O gives a product A, which on treatment with aqueous NaOH produces
(b) 2, 4-diacetyl toluene
Question 50. First product of the reaction between RCHO and NH2NH2 is
(a) RCH NNH2
(b) RCH NH
Question 51. An ester (A) with molecular formula, C9H10O2 was treated with excess of CH3MgBr and the complex so formed, was treated with H2SO4 to give an olefin (B). Ozonolysis of (B) ave a ketone with molecular formula C8H8O which shows +ve iodoform test. The structure of (A) is
(d) p-H3CO – C6H4 – COCH3
Question 52. Which of the following compounds will undergo self aldol condensation in the presence of cold dilute alkali?
(a) CH C — CHO
(b) CH2 CHCHO
Question 53. Which of the following compounds will give positive test with Tollens’ reagent?
(a) Acetic acid
Question 54. (CH3)2C= CHCOCH3 can be oxidised to (CH3)2C=CHCOOH by
(a) chromic acid
(c) Cu at 300°C
Question 55. When aniline reacts with oil of bitter almonds (C6H5CHO) condensation takes place and benzal derivative is formed. This is known as
(a) Schiff ’s base
(b) Benedict’s reagent
(c) Millon’s base
(d) Schiff ’s reagent.
Question 56. Compound A has a molecular formula C2Cl3OH. It reduces Fehling’s solution and on oxidation, it gives a monocarboxylic acid B. If A is obtained by the action of chlorine on ethyl lcohol, then compound A is
(a) methyl chloride
(b) monochloroacetic acid
Question 57. In which of the following, the number of carbon atoms does not remain same when carboxylic acid is obtained by oxidation?
Question 58. The reagent which can be used to distinguish acetophenone from benzophenone is
(b) aqueous solution of NaHSO3
(c) Benedict reagent
(d) I2 and NaOH.
Question 59. If formaldehyde and KOH are heated, then we get
(b) methyl alcohol
(c) ethyl formate
Question 60. Acetaldehyde reacts with
(a) electrophiles only
(b) nucleophiles only
(c) free radicals only
(d) both electrophiles and nucleophiles.
Question 61. Which of the following compounds gives benzoic acid on hydrolysis?
(b) Benzoyl chloride
Question 62. The correct order of decreasing acid strength of trichloroacetic acid (A), trifluoroacetic acid (B), acetic acid (C) and formic acid (D) is
(a) B > A > D > C
(b) B > D > C > A
(c) A > B > C > D
(d) A > C > B > D
Question 63. An organic compound A on treatment with NH3 gives B, which on heating gives C. C when treated with Br2 in the presence of KOH produces ethyl amine. Compound A is
(c) CH3— CHCOOH ι
Question 64. Which of the following represents the correct order of the acidity in the given compounds?
(a) FCH2COOH > CH3COOH > BrCH2COOH > ClCH2COOH
(b) BrCH2COOH > ClCH2COOH > FCH2COOH > CH3COOH
(c) FCH2COOH > ClCH2COOH > BrCH2COOH > CH3COOH
(d) CH3COOH > BrCH2COOH > ClCH2COOH > FCH2COOH
Question 65. Carboxylic acids have higher boiling points than aldehydes, ketones and even alcohols of comparable molecular mass. It is due to their
(a) formation of intramolecular H-bonding
(b) formation of carboxylate ion
(c) more extensive association of carboxylic acid via van der Waals’ forces of attraction
(d) formation of intermolecular H-bonding.
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