ORGANIC COMPOUNDS CONTAINING OXYGEN MCQs- 3

1) Which of the following shows electromeric effect ?
a) Aldehydes
b) Alkanes
c) Alkyl amines
d) Alkyl halides

2) In which of the following is the reaction at the SP2carbon essentially a nucleophilic attack: Benzene (I); Acetone(II); Ethyl acetate(III)
a) II alone
b) II and III
c) I and III
d) I, II and III

3) CH3CH=CHCHO is oxidised to CH3CH=CHCOOH using
a)
b) Selenium dioxide
c)
d) All

4) When an aldehyde was heated with alkali part of it was converted into alcohol and part of it into acid. The aldehyde could be
a) An aliphatic aldehyde other than HCHO
b) An aliphatic aldehyde or salicyaldehyde
c) An aromatic aldehyde other than salicyaldehyde
d) An aromatic aldehyde or HCHO

5) Which of the following compounds does not give a yellow precipitate with and alkali ?
a) 2-hydroxy propane
b) Acetophenone
c) Dimethyl ketone
d) Methyl acetate

6) Two moles of acetone undergo condensation in the presence of dry HCl gas to form
a) Mesitylene
b) Mesityl oxide
c) Phorone
d) None

7) Which of the following is used as a preservative for biological specimens ?
a) Formalin
b) Formic acid
c)
d) Acetic acid

8) Aldol condensation between the following compounds followed by dehydration gives methyl vinyl ketone:
a)
b)
c)
d)

9) Strong oxidizing agents oxidise propanone to
a)
b)
c)
d) None

10) Aldehydes and ketones will not form a crystalline derivative with
a)
b) Phenyl hydrazine
c) Semicarbazide hydrochloride
d) Dihydrogen sodium phosphate

11) The aldol condensation of aldehdyes and ketones takes place through the formation of
a) Carbene
b) Carbanion
c) Carbonium ion
d) Free radical

12) Ethylene chloride on treatment with aqueous K2CO3 gives
a)
b)
c) HCHO
d) CHO-CHO

13) may be regarded as
a) Elimination
b) Addition
c) Addition elimination
d) None

14) The reaction

is
a) Nucleophilic addition
b) Nucleophilic substitution
c) Electrophilic substitution
d) Free radical addition

15) Which of the following is not used in the preparation of a ketone?
a)
b) Heating Ca-salt of an acid
c) Acid hydrolysis of alkyl cyanide
d) Reaction of acid chloride with Grignard reagent

16) Aldol condensation is given by all except
a)
b)
c)
d)

17) Acetaldehyde is the rearrangement product of
a) Ethyl alcohol
b) Vinyl alcohol
c) Allyl alcohol
d) Methyl alcohol

18) The organic compounds A and B react with sodium bisulphite. A reacts with ammonical but B does not. The compounds A and B are
a) RCHO and RCOR
b) R-OR and RCHO
c)
d)

19) Which of the following will not give the iodoform test ?
a) Acetone
b) Ethanol
c) isopropyl alcohol
d) Diethylketone

20) The formula of acetaldol
a)
b)
c)
d)

21) Which of the following reagents cannot distinguish between aldehydes and ketones ?
a) Bendict solution
b)
c)
d)

22) Which of the following does not react with phenyl hydrazine?
a) Ethanol
b) Ethanal
c) Acetone
d) Acetophenone

23) Which of the following compounds will form an alcohol in the presence of alkali?
a)
b)
c)
d)

24) Which of the following aldehyde can give CannizzaroÂ’s reaction with a base ?
a)
b)
c)
d)

25) Aldol condensation is not the product of
a) Two aldehyde molecules
b) Two ketone molecules
c) an aldehyde and a ketone
d) A ketone and an acid

26) A powerful sedative made from acetaldehyde is
a) Acetic anhydride
b) Paraldehyde
c) Acetic acid
d) Acetamide

27) The ozonolysis of 2-methyl but-2-ene gives
a) Aldehyde alone
b) Ketone alone
c) Both
d) None

28) Pinacolone is
a) 2,3-dimethyl-2,3 butanediol
b) 3,3-dimethyl-2-propanone
c) 3,3-dimethyl-2-butanone
d) None

29) The acid catalysed condensation of acetone (3 moles) in the presence of dry HCl gives
a) Phorone
b) Mesityl oxide
c) Mesitylene
d) An aldol

30) The aldol condensation will not occur in
a) HCHO
b)
c)
d)

31) Which reagent will perform the following reduction?


a)
b)
c)
d)

32) The reaction is called
a)
b) Tischenko reaction
c) Claisen condensation
d) Schotten Baumann reaction

33) Benzaldehyde and formaldehyde differ from acetaldehyde in the reaction with
a) NaOH
b) HCN
c) Benedict reagent
d) Semicarbazide

34) A compound with molecular mass 180 is acetylated with to get an acetylated compound with molecular mass 390. The number of amino groups present per molecule of the compound is
a) 2
b) 5
c) 4
d) 6

35) The important step in Cannizzaros reaction is the intermolecular shift of the
a) Proton
b) H-atom
c) Hydride ion
d) Hydrolium ion

36) Aldehydes containinghydrogen atom when reacted with a base normally yield aldols. Which is the product when acetaldehyde reacts with ammonia?
a) Acetaldehyde ammonia
b) 2-hydroxy butanal
c) Methyl amine
d) Crotanaldehyde

37) An aldehyde on treatment with Zn/HCl gives
a)
b)
c)
d) None

38) Which of the following among the three compounds gives the iodoform test ?
a) Pentanone-2 alone
b) Ethanal alone
c) Propanone alone
d) All

39) HCHO and HCOOH are distinguished by treating with
a) TollenÂ’s reagent
b)
c) Fehling solution
d) Benedict solution

40) Which of the following is correct ?
a)
b) Aldehydes are less susceptible to oxidation than ketones
c) Aldehydes are more susceptible to oxidation than ketones
d)

41) Calcium propanoate on heating yields
a) Propan-2-ol
b) Propan-2-on
c) Pentan-3-one
d) Pentan-2-one

42) In which of the following types of reactions are the carbonyl compounds and alkenes similar in behaviour ?
a) Hydrogenation
b) Nucleophilic addition
c) Nucleophilic substitution
d) Electrophilic addition

43) is produced when the following is hydrolysed:
a)
b)
c)
d)

44) Which of the following do not form a trimer without the elimination of water?
a)
b) HCHO
c)
d) All form such a trimer

45) Formaldehyde undergoes polymerisation in presence of weak alkalies such as lime or baryta to form
a) Formose alone
b) alone
c) Both a and b
d) None

46) By passing acetic acid vapour over calcium oxide at 600K, we get
a) Ethanol
b) Acetaldehyde
c) Acetone
d) Acetic anhydride

47) The reaction of CO2 with sodium phenoxide at 400 K results in
a) Benzoic acid
b) Sodium benzoate
c) Sodium salicylate
d) Salicylaldehyde

48) Which of the following can be used to differentiate between ethanal and propanal ?
a)
b)
c)
d)

49) The reaction product of the reaction X is
a) Chloretone
b) Salicylaldehyde
c) Urotropine
d) None of these

50) Propanone does not undergo
a) Oxime formation
b) Hydrazone formation with hydrazine
c) Cyanohydrin formation with HCN
d) Reduction with Fehling’s solution

51) Aldol condensation between which of the following compounds followed by dehydration gives mesityl oxide?
a)
b)
c)
d)

52) Which type of isomerism is exhibited by C5H10 O?
a) Chain isomerism alone
b) Position isomerism alone
c) Functional isomerism alone
d) All of these

53) Dialkyl cadmium reacts with a compound to form a ketone. The compound is an
a) Acid
b) Acid chloride
c) Ester
d) None

54) A@ Those aldehydes and ketones which undergo aldol condensation in the presence of alkali should contain
a)
b)
c)
d) None of the above

55) In aldehydes and ketones the carbon of the carbonyl group is
a)
b)
c) sp hybridized
d) unhybridized

56) The reaction of Grignard reagent with formaldehyde followed by acidification gives
a) An aldehyde
b) A primary alcohol
c) A carboxylic acid
d) A ketone

57) When the vapours of ethyl alcohol are passed over red hot copper (300°C), the product formed is
a) Ethylene
b) Acetaldehyde
c) Acetic acid
d) None of these

58) The general formula for monocarboxylic acids is
a)
b)
c)
d)

59) The IUPAC name for is
a) 1-Hydroxy-4-methylpentanoic acid
b) 1-Methyl-3-hydroxypentanoicacid
c) 4-Hydroxy-2-methylpentanoic acid
d) 4-Carboxypentanol-2

60) The IUPAC name for the acid, C6H5 – CH = CH – COOH is
a) Cinnamic acid
b) 1-Phenyl-1-propenoicacid
c) 3-Phenylprop-2-enoic acid
d) None

61) The IUPAC name of (CH3)2NCH2CHCICOOH is
a) 2-Chloro-2-carboxy-N-ethylethane
b) 2-Chloro-3-(N, N-dimethylamino)-propanoic acid
c) 2-Chloro-1-(N, N-dimethylamino)-propanoic acid
d) 2-Chloro-2-carboxydiethylamine

62) The IUPAC name of is
a) 2-Bromo-4-oxo-3-chloropentanoic acid
b) 3-Chloro-2-bromo-4-oxopentanoic acid
c) 2-Bromo-3-chloro-4-oxopentanoic acid
d) 4-oxo-3-chloro-2-bromopentanoic acid

63) The IUPAC name of the compound,    is
a) 4-Carboxyl-2-methyoxy but 3-en-1-al
b) 4-Formyl-4-methoxy but-2-en-1-oic acid
c) 5-Formyl-4-methoxypent-2-en-1 -oic
d) 4-Methoxy-5-oxopent-2-en-1-oic acid

64) The correct IUPAC name for the compound, HOCH2 – CH(NH2) – COOH is
a) 2-Amino-2-hydroxymethylethanoic acid
b) 3-Amino-2-hydroxypropanoic acid
c) 1-Hydroxy-2-aminopropanoic acid
d) 2-Amino-3-hydroxypropanoic acid

65) Monocarboxylic acids are functional isomers of
a) Alcohols
b) Ethers
c) Esters
d) Aldehydes and ketones

66) The type of isomerism not shown by aliphatic carboxylic acids is
a) Chain isomerism
b) Position Isomerism
c) Functional Isomerism
d) Optical isomerism

67) How many stereoisomers (geometrical and optical) are possible for the following compound ?

CH3CH = CHCH2CH(OH)COOH
a) 1
b) 2
c) 3
d) 4

68) Which one of the following reacts with Grignard reagent to form an addition product which can be hydrolysed to a carboxylic acid?
a)
b)
c)
d) None

69) In the following reaction sequence,

The product Y is
a) Benzonitrile
b) Benzene
c) Benzoic acid
d) Benzamide

70) A halogen compound A on hydrolysis with dilute alkali followed by acidification gives acetic acid. The compound A is
a)
b)
c)
d)

71) Which of the following on hydrolysis with dilute alkali followed by acidification gives benzoic acid?
a) Benzotrichloride
b) Benzal chloride
c) Benzyl chloride
d) p-Chlorotoluene

72) Acetic acid is obtained when
a) Methyl alcohol is oxidised with potassium permanganate
b) Formaldehyde is oxidised with potassium dichromate and sulphuric acid
c) Acetonitrile is hydrolysed with a dilute mineral acid
d) Glycerol is heated with sulphuric acid

73) Ethanoic acid is prepared commercially from
a) Ethyne alone
b) Ethanol alone
c) Methanal alone
d) Both ethyne and ethanol

74) In the Quick Vinegar Process, the aerial oxidation of ethyl alcohol to acetic acid is brought about by
a) Acetaldehyde
b) Maltase
c) Invertase
d) Mycoderma aceti

75) Hydrolysis of hydrogen cyanide results in the formation of
a) Formic acid
b) Acetic acid
c) Formaldehyde
d) Acetaldehyde

76) The sodium salt of formic acid on strong heating followed by acidification gives
a) Formic acid
b) Oxalic acid
c) Formaldehyde
d) Acetaldehyde

77) The acid D obtained through the following sequence of reactions is


a) Succinic acid
b) Malonic acid
c) Maleic acid
d) Oxalic acid

78) Which of the following acids on heating loses a molecule of H2O to form an a,b-unsaturated acid?
a)
b)
c)
d)

79) In the following reactions, the compounds A and B are


a)
b)
c)
d)

80) Acetic acid exists as a dimer in C6H6 due to
a) Condensation reaction
b) Hydrogen bonding
c) Presence of a carboxyl group
d) None

81) Which of the following statements is not applicable to carboxylic acids?
a) They are polar molecules
b) They are stronger acids than mineral acids
c) They form intermolecular hydrogen bonds
d) They have higher boiling points than the corresponding alcohols

82) Which of the following has the highest boiling point?
a)
b)
c)
d)

83) The compound which forms the strongest hydrogen bond is
a)
b)
c)
d)

84) A carboxylic acid group can be detected by
a) Sodium bisulphite test
b)
c)
d) NaHCO3

85) The carboxylic acid which has the maximum solubility in water is
a) Phthalic acid
b) Succinic acid
c) Malonic acid
d) Salicylic acid

86) The OH group in alcohols is neutral but in carboxylic acids, it is acidic because
a) In alcohols, the OH group is attached to an electron-donating alkyl groups
b) Carboxylic acids are electrovalent compounds
c) In carboxylic acids, the OH group is attached to the electron-withdrawing carbonyl group
d) Alcohols are covalent compounds

87) The acidic nature of carboxylic acids, RCOOH RCOO + H+ is due to
a) A high degree of ionization of carboxylic acids
b) the greater resonance stabilization of the carboxylic acid over the carboxylate ion
c) the greater resonance stabilization of the carboxylate ion over the carboxylic acid
d) the solubility of carboxylic acids in water

88) The compound which does not give effervescence with sodium bicarbonate is
a) Formic acid
b) Acetic acid
c) Phenol
d) Benzoic acid

89) Which of the following would be expected to be the most highly ionized in water?
a)
b)
c)
d)

90) The pKa values of the four carboxylic acids are given below. Which of the following is the weakest acid?
a) 4.38
b) 2.87
c) 1.26
d) 0.64

91) Phenol is a weaker acid than acetic acid because
a) The phenoxide ion is better stabilized by resonance than the acetate ion
b) the acetate ion is better stabilized by resonance than the phenoxide ion
c) Phenol is less soluble in water than acetic acid
d) Both the phenoxide ion and the acetate ion are equally stable

92) Which of the following is the weakest acid?
a)
b)
c)
d)

93) Rewrite the following in the increasing order of acidity.

(i) Benzoic acid

(¡¡) p-Methoxybenzoic acid

(¡¡¡) o-Methoxybenzoic acid
a)
b)
c)
d)

94) Which of the following dicarboxylic acids is the most acidic?
a) Maleic acid
b) Fumaric acid
c) Succinic acid
d) Malonic acid

95) The increasing value of dissociation constants Ka of


a)
b)
c)
d)

96) The increasing pKa of o, m- and p-nitrobenzoic acid is
a) p < m < o
b) o < m <p< font=””>
c) o < p < m
d) m < p < o

97) When a mixture of one mole of benzoic acid and one mole of phenol in water is treated with one mole of NaHCO3, the product formed will consist of
a)
b)
c)
d)

98) The acidic strength of formic acid, acetic acid and benzoic acid decreases in the order
a) Benzoic acid, formic acid, acetic acid
b) Formic acid, acetic acid, benzoic acid
c) Formic acid, benzoic acid, acetic acid
d) Benzoic acid, acetic acid, formic acid

99) Amongst the acids,

(i) CH = CCOOH
(ii) CH2 = CHCOOH and
(iii) CH3CH2COOH, the acid strength follows the sequence


a)
b)
c)
d)

100) The increasing order of acidity of , and – chlorobutyric acids is
a)
b)
c)
d)


Answer

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