Chemistry Chapter 17 Entry Test MCQs
26. Paraldehyde is
a. A trimer of acetaldehyde
b. A trimer of formaldehyde
c. A hexamer of acetaldehyde
d. A hexamer of formaldehyde
27. Methyl ketone group is identified by
a. Tollen’s reagent
b. Iodoform test
c. Shiff’s reagent
d. Fehling solution
28. The cyanohydrin of a compound X on hydrolysis gives lactic acid; the X is
a. HCHO
b. (CH3)2CO
c. C6H5CH2CHO
d. CH3CHO
29. Which one of the following compounds is most reactive towards nucleophillic addition?
a. CH3COCH3
b. CH3CHO
c. PhCOPh
d. PhCOCH3
30. Formaldehyde gives an additive product with methyl magnesium iodide which on aqueous hydrolysis gives:
a. propyl alcohol
b. methyl alcohol
c. ethyl alcohol
d. isopropyl alcohol
31. Which of the following compounds undergo aldol condensation?
a. (CH3)3CCHO
b. HCHO
c. CH3CHO
d. CCI3CHO
32. Which of the following products is formed when benzaldehyde is treated with CH3MgBr and the addition product so obtained is subjected to acid hydrolysis?
a. secondary alcohol
b. a primary alcohol
c. tert-Butyl alcohol
d. phenol
33. The compound that will not give iodoform on treatment with alkali and iodine is
a. Diethyl ketone
b. Acetone
c. isopropyl alcohol
d. Ethanol
34. Which one of the following is reduced with zinc and hydrochloric acid to give the corresponding hydrocarbon?
a. acetamide
b. ethyl acetate
c. butan-2-one
d. acetic acid
35. Treatment of propionaldehyde with dil. NaOH solution gives
a. CH3CH2CHOHCH2CH2CHO
b. CH3CH2COCH2CH2CHO
c. CH3CH2COOCH2CH2CH3
d. CH3CH2CHOHCH(CH3)CHO
36. The formation of cyanohydrin from a ketone is an example of
a. nucleophilic addition
b. electrophilic addition
c. electrophilic substitution
d. nucleophilic substitution
37. Paraldehyde is helpful and used as______.
a. Polymer
b. Poison
c. Medicine
d. Dye
38. Industrial production of acetaldehyde is done by
a. Reduction of acetic acid
b. Oxidation of ethanol
c. Hydration of acetylene
d. Oxidation of ethylene
39. Calcium formate on dry distillation yields
a. Formic acid
b. Formaldehyde
c. Ketone
d. Acetaldehyde
Oxidation + Reduction + Tests
40. Methyl ethyl ketone is prepared by the oxidation of
a. 2-butanol
b. 2-propanol
c. t-butyl alcohol
d. 1-butanol
41. A mixture of carbonyl and non-carbonyl compounds can be separated by using:
a. Sodium hydroxide
b. Water
c. Hydrochloric acid
d. Sodium bisulphite
42. Methyl ketones usually characterized by:
a. Iodoform test
b. Tollen’s tests
c. Fehling solution test
d. Lucas test
43. Which pair of compounds cannot be distinguished by means of Tollen’s test:
a. HCHO & CH3CHO
b. HCHO & CH3COCH3
c. C6H5COCH3 & C6H5CHO
d. CH3CHO & CH3COCH3
44. Which of the following statements is incorrect about ethanal and propanone:
a. Both can be prepared by oxidation of alcohols
b. Both gives wine red or orange colour with sodium nitroprusside
c. Both react with 2,4-Dinitrophenyl hydrazine reagent
d. Both give positive iodoform test
45. A diabetic patient is examined by asking him to bubble his breath through aqueous alkaline iodine reagent. The exhaled breath of diabetic patient gives positive result as it contains:
a. Propyne
b. Propanal
c. 1-Propanol
d. Propanone
46. When aldehydes react with Tollen’s reagent:
a. An alcohol is produced
b. A ketone is produced
c. Ag+ ions are reduced
d. Ag+ ions are produced
47. Which one of the following on oxidation will not give a carboxylic acid with the same number of carbon atoms
a. CH3CH2CH2OH
b. CH3COCH3
c. CH3CH2CHO
d. CCl3CH2CHO
48. Glucose + Tollen’s reagent = Silver mirror shows
a. Presence of alkaline group
b. Presence of acidic group
c. Presence of aldehyde group
d. Presence of ketonic group
49. The pair of compounds in which both the compounds give positive test with Tollen’s reagent is
a. Fructose and Sucrose
b. Glucose and Sucrose
c. Glucose and Fructose
d. Acetophenone and Hexanal
50. The most appropriate reagent to distinguish between acetaldehyde and formaldehyde is
a. Schiff’s reagent
b. Fehling’s solution
c. Iodine in presence of base
d. Tollen’s reagent
51. A substance C4H10O yields on oxidation a compound, C4H8O which gives an oxime and a positive iodoform test. The original substance on treatment with conc. H2SO4 gives C4H8. The structure of the compound is
a. CH3CH2CH2CH2OH
b. (CH3) 3COH
c. CH3CH2 – O – CH2CH3
d. CH3CHOHCH2CH3
52. When compound X is oxidized by acidified potassium dichromate, compound Y is formed. Compound Y on reduction with LiAIH4 gives X. X and Y respectively are
a. C2H5OH, CH3COCH3
b. C2H5OH, CH3COOH
c. CH2CHO, CH3COCH2
d. CH3COCH3, CH3COOH
53. 3-Pentanone forms a yellow precipitate with 2,4-dinitrophenyl hydrazine but does not form precipitate with:
a. Saturated NaHSO3 solution
b. Ammonical silver nitrate solution
c. Aqueous NaOH and Iodine
d. All of these
54. The reduction of __ gives secondary alcohols always.
a. Ketone
b. Alcohol
c. Carboxylic acid
d. Aldehyde
55. The reduction of __ gives Primary alcohols always.
a. Ketone
b. Alcohol
c. Carboxylic acid
d. Aldehyde
56. An alkaline solution of cupric tartrate complex ion is called
a. Benedict’s solution
b. Fehling’s solution
c. Tollen’s reagent
d. None of these
57. An aldehyde when strongly heated with Fehling’s reagent gives brick red precipitate of
a. CuO2
b. CuO
c. Cu(OH)2
d. Cu2O
58. Acetophenone is also called
a. Ethyl methyl ketone
b. Diphenyl ketone
c. Methyl phenyl ketone
d. Dimethyl ketone