ORGANIC COMPOUNDS CONTAINING OXYGEN MCQs- 1

1) During the reaction of acetylene with dil. H2SO4 in presence of HgSO4, the compound initially formed is
a)
b)
c)
d)

2) Selective oxidation of
R1C = C(CH2)/7CH = CHR2 with CrO3 in acetic acid gives

a)
b)
c)
d)

3) Which of the following on reductive ozonolysis will give only glyoxal?
a) Ethylene alone
b) Benzene alone
c) Acetylene alone
d) Both (b) and (c)

4) An unsaturated hydrocarbon on ozonolysis gives one mole each of formaldehyde, acetal-dehyde and methylglyoxal. The structure of the hydrocarbon is
a) alone
b) alone
c) alone
d) Both (a) and (c)

5) The reagent/s required for the conversion of R1CH = CHR2 R1CH =O+O=CHR2 is/are
a)
b) Lemieux reagent
c) alone
d) Both (a) and (b)

6) The products obtained when 2-pentyne is reacted with H2O, H+, Hg2+ is/are
a) alone
b) alone
c)
d) Both (a) and (b).

7) Which of the following alkenes when passed through conc. H2SO4 followed by hydrolysis with boiling water would give tert-butyl alcohol?

a) Ethylene
b) Isobutylene
c) Propylene
d) 1-Butene.

8) 2-Methylpropene upon hydroboration-oxidation gives
a) 2-Methyl-1-propanol
b) 2-Methyl-2-propanol
c) 2-Propanol
d) 1-Propanol.

9) In India, ethyl alcohol is mainly manufactured by
a) Destructive distillation of wood
b) Hydrogenation of CO
c) Fermentation of molasses
d) Catalytic oxidation of ethane.

10) Glycerine is used as a preservative for fruits and eatables because
a) It makes them sweet
b) It keeps the food moist
c) It acts as an insecticide
d) All the three above.

11) Wood spirit is the common name of
a) Methyl alcohol
b) Ethyl alcohol
c) Amyl alcohol
d) Benzyl alcohol

12) Pyroligneous acid does not contain
a) Methyl alcohol
b) Ethyl alcohol
c) Acetone
d) Acetic acid

13) Treatment of pyroligneous acid with milk of lime followed by distillation gives
a) Acetone only
b) a mixture of acetic acid and methanol
c) Methanol only
d) a mixture of methanol and acetone

14) Ethanol and methanol are miscible in water due to
a) Their acidic character
b) van der Waals forces of attraction
c) Dipole-dipole interactions
d) Intermolecular hydrogen bonding.

15) The vapour pressure of an aqueous solution of methanol is
a) Less than that of water
b) More than that of water
c) Equal to that of water
d) May be more, less or equal depending upon temperature.

16) In the homologous series of monohydric alcohols, the solubility in water decreases with increase in molecular mass due to an
a) Increase in the hydrocarbon part
b) Increase in hydrogen bonding
c) Increase in boiling point
d) (A) and (B)

17) Which of the following alcohols is least soluble in water?
a)
b)
c)
d)

18) The boiling points of alcohols are much higher than hydrocarbons of comparable molecular masses due to
a) Dipole-dipole interactions
b) Intermolecular H-bonding
c) Intramolecular H-bonding
d)

19) The reaction given below suggests that alcohols are

2 ROH + 2 Na ® 2 RONa + H2
a) Acidic
b) Basic
c) Amphoteric
d) Neutral in character.

20) 23 g of sodium will react with methanol to give
a) One mole of oxygen
b) 1/2 mole of hydrogen
c) One mole of hydrogen
d) 1/4 mole of oxygen.

21) The correct order of the relative acidic strength of alcohols follows the sequence
a) Tertiary > Secondary > Primary
b) Secondary > Primary > Tertiary
c) Primary > Secondary > Tertiary
d) Primary > Tertiary > Secondary.

22) The order of reactivity of alcohols towards sodium metal is
a) Primary > Secondary > Tertiary
b) Primary < Secondary < Tertiary
c) Primary < Secondary < Tertiary
d) Primary > Secondary < Tertiary

23) An aqueous solution of ethyl alcohol
a) Does not affect a litmus solution
b) Changes red litmus blue
c) Changes blue litmus red
d) Decolourises litmus solution.

24) Which of the following alcohols is the strongest acid ?
a)
b)
c)
d)

25) The structural formula of the alcohol that on dehydration would give 2-methylpropene as the major product is
a)
b)
c)
d)

26) A reaction in which ethanol acts as a base is
a) Acid-catalysed dehydration to ethene
b) Reaction with sodium
c) Dehydrogenation with hot copper
d) Reaction with Grignard reagent.

27) Tertiary butyl alcohol is heated with conc. and the alkene thus formed is subjected to ozonolysis. The products of ozonolysis are reduced with. The final products is/are
a) 2-Methylpropan-2-ol
b) A mixture of methanol + ethanol
c) A mixture of 2-propanol + methanol
d) A mixture of ethanol + formic acid

28) Which of the following compounds decolourises aqueous bromine and gives white fumes of HCI on reaction with PCI5 ?
a)
b)
c)
d)

29) Which of the following compounds will give a yellow precipitate on warming with a solution of iodine and aqueous alkali ?
a)
b)
c)
d)

30) A neutral compound with molecular formula C3H8O evolves H2 when treated with sodium metal and gives the iodoform test. The compound is

a)
b)
c)
d)

31) Ethyl alcohol can be distinguished from methanol
a) By the action of HCI
b) By the action of ammonia
c) By determination of their solubilities
d) by the iodoform test.

32) A convenient reagent to distinguish ethyl alcohol from n- propyl alcohol is
a)
b)
c)
d) Iodine with aq. NaOH solution.

33) When vapours of an alcohol are passed over hot reduced copper, it gives an alkene. The alcohol is
a) Primary
b) Secondary
c) Tertiary
d) None of these.

34) Which of the following alcohols will not be easily oxidised by ?
a)
b)
c)
d)

35) Which of the following alcohols on oxidation give carboxylic acids with lesser number of carbon atoms ?
a) alone
b) alone
c) alone
d) Both (b) and (c)

36) A neutral compound gives copious evolution of HCl with PCl5. This suggests that the compound contains a/an
a) Alcoholic group
b) Aldehyde group
c) Ketonic group
d) Ether group

37) Primary, secondary and tertiary alcohols is distinguished by the
a) Fehling solution test
b) Victor-Meyer test
c) Hoffmann test
d) Beilstein test.

38) Primary, secondary and tertiary alcohols may be distinguished by converting them into the corresponding nitroparaffins which are then treated with
a) Aqueous NaOH
b)
c) Conc. HCI
d)

39) In the test for alcohols, the characteristic colour given by the secondary alcohols is
a) Blue
b) Green
c) Red
d) Purple.

40) There are four alcohols P, Q, R and S which have 3,2,1 and zero alpha hydrogen atom(s) respectively. Which one of the following will not respond to test ?
a) P
b) Q
c) R
d) S

41) In the test, a red colouration is shown by a
a)
b)
c)
d) Phenol

42) The compound which does not react with Lucas reagent is
a) n-Butyl alcohol
b) sec-Butyl alcohol
c) Isobutyl alcohol
d) tert-Butyl alcohol

43) In Lucas test of alcohols, the appearance of cloudiness is due to the formation of
a) Aldehydes
b) Ketones
c) Acid chlorides
d) Alkyl chlorides

44) The relative rates of esterification of the following acids with methanol follows the order:
a)
b)
c)
d)

45) Grain alcohol is the common name of
a) Amyl alcohol
b) Methyl alcohol
c) Ethyl alcohol
d) Isopropyl alcohol.

46) Alcoholic beverages contain
a)
b)
c)
d)

47) Occasional large scale deaths due to illicit liquor consumption are due to
a) the presence of methyl alcohol
b) Old stocks of ethyl alcohol
c) the presence of ethyl alcohol
d) the presence of carbonic acid.

48) Rectified spirit is denatured by adding
a) Methyl alcohol and formic acid
b) Methyl alcohol and benzene
c) Methyl alcohol and pyridine
d) Methyl alcohol and acetic acid,

49) Denatured spirit is mainly used as
a) a drug
b) a reagent in laboratory
c) a fuel in automobiles
d) an industrial solvent for paints and varnishes.

50) Methanol cannot be dried over anhydrous CaCI2 because
a)
b)
c)
d)

51) Ethanol cannot be dried over anhydrous CaCI2 because
a)
b)
c)
d)

52) Absolute alcohol cannot be prepared from rectified spirit by simple distillation because
a) The boiling points of water and alcohol are very close
b) Water and alcohol form a constant boiling azeotropic mixture
c)
d) Alcohol molecules are highly hydrated.

53) Absolute alcohol is prepared from rectified spirit by
a) Simple distillation
b) Fractional distillation
c) By azeotropic distillation with benzene
d) Steam distillation.

54) Power alcohol is a mixture of
a) 80% Absolute alcohol + 20% petrol
b) 20% Absolute alcohol + 80% petrol
c) 20% Methanol + 80% petrol
d) 80% Methanol + 20% petrol.

55) Oxygen when passed through an ethereal solution of phenylmagnesium iodide followed by acid hydrolysis gives
a) Benzene
b) Benzoic acid
c) Phenol
d) Salicyclic acid.

56) Phenol can be prepared by the reaction between
a)
b)
c)
d)

57) Phenol is prepared commercially from
a) Ethylbenzene
b) Isopropylbenzene
c) n-Propyibenzene
d) Toluene.

58) Cumene is used for the commercial preparation of phenol. Chemically cumene is
a) 2-Phenylpropane
b) Ethylbenzene
c) n-Propylbenzene
d) 1, 3, 5-Trimethylbenzene

59) Phenol is commercially isolated from the following fraction of coal-tar distillation:
a) Light oil
b) Middle oil
c) Cresote oil
d) Antheracene oil

60) The acidic character of phenol is due to the
a) Greater resonance stabilization of the phenoxide ion over phenol
b) Greater resonance stabilization of phenol over the phenoxide ion
c) tautomerism occurring in phenol
d) oxygen being more electronegative than hydrogen

61) The correct order of the relative acidic strength of phenol, ethyl alcohol and water is
a) Phenol > Water > Ethyl alcohol
b) Ethyl alcohol > Water > Phenol
c) Ethyl alcohol > Phenol > Water
d) Water > Phenol > Ethyl alcohol

62) Which of the following compounds will react with sodium hydroxide ?
a)
b)
c)
d)

63) Which of the following compounds, when dissolved in water, gives a solution with pH less than seven ?
a)
b)
c)
d)

64) The reaction,  suggests that
a) Phenol is a stronger acid than carbonic acid
b) Carbonic acid is a stronger acid than phenol
c) Water is a stronger acid than phenol
d) None of the above.

65) Amongst the following phenols, the strongest acid is
a) p-Nitrophenol
b) 2, 4-Dinitrophenol
c) Picric acid
d) p-Chlorophenol.

66) Increasing pKa values of o, m and p-cresols is
a) o < p < m
b) m< p < o
c) m < o < p
d) p < o < m

67) Which of the following compounds will not evolve CO2 when treated with aq. NaHCO3 solution ?
a) Benzoic acid
b) 2, 4-Dinitrophenol
c) 2, 4, 6-Trinitrophenol
d) p-chlorophenol

68) Phenol gives a characteristic colouration with
a) Iodine solution
b) Bromine water
c)
d) Ammonium hydroxide.

69) Which of the following reagents cannot be used to distinguish between phenol and benzyl alcohol ?
a)
b)
c)
d) NaOH.

70) Which of the following is the major product formed when phenol is treated with dilute nitric acid ?
a) m-Nitrophenol
b) p-Nitrophenol
c) 2, 4, 6-Trinitrophenol
d) o-Nitrophenol.

71) Treatment of phenol with nitrous acid (NaNO2 + HCI) gives mainly
a) p-Nitrosophenol
b) p-Nitrophenol
c) Picric acid
d) m-Nitrophenol.

72) The ring in 2, 4, 6-Trinitrophenol, compared to benzene, is
a) Electron deficient
b) Electron rich
c) of about the same electron density
d) None of these.

73) Which of the following reagents can be used to prepare salicylaldehyde from phenol ?
a)
b)
c)
d) Heat with CaO + NaOH.

74) Phenol reacts with PCI5 to give mainly
a) p-Chlorophenol
b) Chlorobenzene
c) o- and p-Chlorophenols
d) Triphenylphosphate.

75) Sulphonation of phenol with conc. H2SO4 at 288-293 K gives, as the major product,
a) o-Phenolsulphonic acid
b) Sulphanilic acid
c) p-Phenolsulphonic acid
d) Sulphone.

76) p-Phenolsulphonic acid is obtained as the major product when phenol is treated with
a)
b)
c)
d)

77) When o-phenolsulphonic acid is heated to 373 K, it gives
a) Phenol
b) p-Phenolsulphonic acid
c) Benzenesulphonic acid
d) Benzene.

78) When o- or p-phenolsulphonic acid is heated with conc. HNO3, the product formed is
a) 2, 4-Phenoldisulphonic acid
b) 2, 6-Dinitro-4-phenolsulphonic acid
c) 4, 6-Dinitro-2-phenolsulphonic acid
d) 2, 4, 6-Trinitrophenol.

79) When o- or p-phenolsulphonic acid is treated with bromine water, the product formed is
a) 2, 4 -Dibromophenol
b) 2, 4, 6 -Tribromophenol
c) 3-Bromophenol boric acid
d) 3, 5 -Dibromophenol

80) The compound responsible for the institution of the Nobel Prize is
a) Nitroglycerine
b) T.N.T.
c) Picric acid
d) Ammonium nitrate

81) The well known antipyretic aspirin is obtained when
a)
b) Salicyaldehyde is treated with acetic anhydride
c)
d)

82) The intestinal antiseptic salol is obtained when salicylic acid is treated with
a)
b)
c)
d) soda-lime at 630 K.

83) A vicinal glycol has two alcoholic groups
a) On the same carbon
b) On adjacent carbon atoms
c) On alternate carbon atoms
d) Anywhere along the carbon chain.

84) Which of the following,

I. R—CO—CO—R

II. R—CO—CHOH—R

III. R—CHOH—CH2—CHOH—R

IV. R—CHOH—CHOH—R

will be oxidised by ?
a) I, II and III
b) I, III and IV
c) I, II and IV
d) II, III and IV

85) Which of the following does not react with aqueous periodic acid ?
a)
b)
c)
d)

86) Oxalic acid can be converted into formic acid in one step by heating it
a) alone at 473 K
b) with glycerol at 383 K
c) with glycerol at 503 K
d)

87) An organic compound with the molecular formula when treated with sodium metal and gives two moles of formaldehyde on oxidation with. The compound is
a) Acetic acid
b) Methyl acetate
c) Ethylene glycol
d) Ethyl alcohol.

88) Ethylene glycol reacts with excess of to give
a) 1,1-Dichloroethane
b) 1,2-Dichloroethane
c) 1,1, 2-Trichloroethane
d) 1, 1, 2, 2-Trichloroethane.

89) Ethylene glycol when heated with anhydrous ZnCl2 gives
a) Vinyl alcohol
b) Ethyl alcohol
c) Acetaldehyde
d) Acetic acid.

90) When heated with conc., ethylene glycol gives
a) Acetaldehyde
b) Diethylene glycol
c) 1, 4-Dioxane
d) Acrolein

91) Which of the following functional groups are protected in chemical reactions by ethylene glycol ?
a) Alcohol alone
b) Acids alone
c) Aldehydes alone
d) Aldehydes and ketones.

92) In cold countries, ethylene glycol is added to water in the radiators of cars during winter to
a) Lower the freezing point of water
b) Reduce the viscosity of water
c) Reduce the specific heat of water
d) Increase the conductivity of water.

93) The IUPAC name of glycerine is
a) Glycerol
b) 1,2-Ethanediol
c) 1, 2, 3-Propanetriol
d) 1, 2, 3-Trihydroxypropane.

94) Glycerol contains
a) Three primary alcoholic groups
b) One primary and two secondary groups
c) One secondary and two primary groups
d) Three secondary alcoholic groups.

95) Hydrolysis of oils and fats gives glycerol and long chain fatty acids containing mostly
a) an even number of carbon atoms
b) an odd number of carbon atoms
c) Three to five carbon atoms
d) None of the above

96) Saponification means hydrolysis of an ester with
a) Dil. NaOH
b)
c) Enzymes
d) All the three above

97) The compound having the highest boiling point among the following is
a) Acetic acid
b) Glycerol
c) Ethyl alcohol
d) Ethylene glycol

98) Which of the following has the highest boiling point?
a) Ethanol
b) Ethanoic acid
c) Glycerol
d) Ethylene glycol.

99) If there be a compound of the formula, CH3— C(OH)3, which of the following compounds would be obtained from it without treatment with any reagent ?
a) Methanol
b) Ethanol
c) Acetic acid
d) Acetaldehyde.

100) Glycerol boils at 563 K with slight decomposition. Therefore, impure glycerol is purified by
a) Simple distillation
b) Fractional distillation
c) Steam distillation
d) Distillation under reduced pressure.


Answer

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