Aldehydes, Ketones and Carboxylic Acids MCQs Mock Test of Class 12th Chemistry

Question 1. To differentiate between pentan-2-one and penta-3-one a test is carried out. Which of the following is the correct answer?

Question 2. Which compound is obtained when acetaldehydes are treated with dilute solution of caustic soda?

Question 3. Identify the products (X) and (Y) in the given reaction

Question 4. Which of the following compound will undergo self aldol condensation in the presence of cold dilute alkali?

Question 5. The best reagent to convert pent-3-en-2-ol into pent-3-en-2-one is

Question 6. Which of the following reactions will not result in the formation of carbon-carbon bonds?

Question 7. Given, cyclohexanol (I), acetic acid (II) 2,4,6-trinitrophenol (III) and phenol (IV). In these, the order of decreasing acidic character will be

Question 8. When ethanal is treated with Fehling’s solution, it gives a precipitate of

Question 9. Which of the following aldehydes contains α-C atom but does not have any α-H atom?

Question 10. Which of the following compounds on heating with aqueous KOH, produces acetaldehyde?

Question 11. Which of the following give an explosive RDX on nitration?

Question 12. The reagent used for the separation of acetaldehyde from acetophenone is

Question 13. Self condensation of acetaldehyde in the presence of dilute alkalies gives

Question 14. Which of the following compounds will not undergo aldol condensation?

Question 15. Which one of the following undergoes reaction with 50% sodium hydroxide solution to give the corresponding alcohol and acid?

Question 16. Ketones react with Mg-Hg over water gives

Question 17. An organic compound X on treatment with acidified K2Cr2O7 gives compound Y which reacts with I2 and sodium carbonate to form triiodomethane. The compound X can be

Question 18. Which of the following compounds with molecular formula C5H10 yields acetone on ozonolysis?

Question 19. Which is not true about acetophenone?

Question 20. A carbonyl compound reacts with hydrogen cyanide to form cyanohydrin which on hydrolysis forms a racemic mixture of α-hydroxy acid. The carbonyl compound is

Question 21. 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 22. By combining the two calcium salts of carboxylic acids, we are preparing 2-butanone. Find the correct pair from the following

Question 23. Which of the following represents the correct order of the acidity in the given compounds?

Question 24. Consider the acidity of the following carboxylic acids. I. PhCOOH II. o-NO2C6H4COOH III. p-NO2C6H4COOH IV. m – NO2C6H4COOH Which of the following order is correct?

Question 25. In the following reaction, The major amounts of X and Y are

Question 26. The property which distinguishes formic acid from acetic acid is

Question 27. The product of acid hydrolysis of P and Q can be 0 distinguished by

Question 28. Hydrolysis of an ester gives a carboxylic acid which on Kolbe’s electrolysis yield ethane. The ester is

Question 29. A compound does not react with 2,4-dinitrophenyl hydrazine, compound is

Question 30. When ethanal reacts with CH3MgBr and C2H5OH/dry HCl, the product formed are

Question 31. Arrange the following compounds in decreasing order of their boiling points. CH3CHO, CH3CH2OH, CH3OCH3, CH3CH2CH3

Question 32. Two moles of acetic acid are heated with P2O5. The product formed is

Question 33. Vinegar obtained from sugarcane has (a) CH3COOH (b) C6H5COOH (c) HCOOH (d) CH3CH2COOH Direction (Q.NOs.36-37): In the following questions more than one of the answers given may be correct. Select the correct answers and mark it according to the codes. Codes

Question 34. The acids which do not contain a —COOH group are

Question 35. Following conversion can be carried out by using

Question 36. An organic compound ‘X’ having molecular formula C5H10O yields phenyl hydrazone and gives negative response to the iodoform test and Tollen’s test. It produces n-pentane on reduction. ‘X’ could be (a) pentanal (b) 2-pentanone (c) 3-pentanone (d) n-amyl alcohol Direction (Q.Nos.41-44): Each of these questions contains two statements : Assertion and Reason. Each of, these questions also has four alternative choices, only one of which is the correct answer. You have to select one of the codes (a),(b),(c) and (d) given below.

Question 37. The correct order of stability of the following tautomeric compounds,is

Question 38. CH3CHO and C6H5CH2CHO can be distinguished chemically by

Question 39. The correct order of decreasing acidic strength of trichloroacetic acid (A), trifluoroacetic acid (B), acetic acid (C) and formic acid (D) is

Question 40. Clemmensen reduction of a ketone is carried out in the presence of which of the following?

Question 41. Which of the following reactions will give benzolphenone? (i) Benzoyl chloride + Benzene + AlCl3 (ii) Benzoyl chloride + Phenylmagnesium bromide (iii) Benzoyl chloride + Diphenyl cadmium

Question 42. Propanone can be prepared from ethyne by

Question 43. The oxidation of toluene to benzaldehyde by chromyl, chloride is called

Question 44. There is a large difference in the boiling points of butanal and butanal-1-oldueto

Question 45. The addition of HCN to carbonyl compounds is an example of

Question 46. Aldehydes other than formaldehyde react with Grignard’s reagent to give addition products which on hydrolysis give

Question 47. Which of the following will not give aldol condensation?

Question 48. Which of the following compounds does not react with NaHSO3?

Question 49. The product of hydrolysis of ozonide of 1-butene are

Question 50. α-Hydroxypropanoic acid can be preapred from ethanal by following the steps given in the sequence