Aldehyde and Ketones

No

Questions

Help

1

Carbon in carbonyl group is hybridized

( )

Sp

( )

Sp2

( )

Sp3

( )

None

Single Answer

2

Dipole moment of carbonyl compounds lies between

( )

3-4

( )

2-3

( )

2.3-2.8

( )

None of these

Single Answer

3

Aldol condensation is

( )

Between alcohol and alkene

( )

Self addition

( )

Between acid and base

( )

Between aldehydes and ketones

Single Answer

4

Vinyl alcohol and acetaldehyde are

( )

Functional group isomers

( )

Epimers

( )

Metamers

( )

Tautomers

Single Answer

5

Acetone is

( )

Highly volatile and flammable

( )

Volatile only

( )

Only flammable

( )

None of these

Single Answer

6

Formaldehyde polymerizes to

( )

O-formaldehyde

( )

P-formaldehyde

( )

M-formaldehyde

( )

None of these

Single Answer

7

Which one of the following forms acetone on ozonalysis

( )

1-butene

( )

Propene

( )

2-butene

( )

2-methyl,1-propene

Single Answer

8

Acetone on oxidation gives

( )

CH3COOH

( )

RCH2OH

( )

C2H5OH

( )

CH3CHO

Single Answer

9

Benzaldehyde in reaction with alkaline KMnO4 gives

( )

Picric acid

( )

Benzoic acid

( )

Benzyl alcohol

( )

CO2 and H2O

Single Answer

10

The compound which reacts with fehling solution is

( )

CH2ClCH2Cl

( )

HCOOH

( )

C6H5CHO

( )

C6H5COOH

Single Answer

11

Which one of the following gives silver mirror test?

( )

CH3COCH3

( )

CH3CHO

( )

CH3COOH

( )

CH3CH2OH

Single Answer

12

Which one of the following cannot be used to distinguish aldehydes from ketones?

( )

Schiff's reagent

( )

Nessler reagent

( )

Fehling solution

( )

Benedict solution

Single Answer

13

An aldehyde which does not give red ppt with fehling solution is

( )

CH3CH2CHO

( )

CH3CHO

( )

C6H5CHO

( )

CH2O

Single Answer

14

Which of the following reaction is used for detecting the presence of carbonyl group?

( )

Reaction with hydrazine

( )

Reaction with phenyl hydrazine

( )

Reaction with hydroxylamine

( )

All these

Single Answer

15

Which of the following is most reactive?

( )

C2H6

( )

Formaldehyde

( )

Ketone

( )

CH3-O-CH3

Single Answer

16

Chemical formula of chloral is

___________________________________

Fill In the Blank

17

Bond angle in aldehyde and ketones is

___________________________________

Fill In the Blank

18

The reaction of formaldehyde with NH2OH is an example of

( )

Polymerization reaction

( )

Hydration reaction

( )

Alkylation reaction

( )

Condensation reaction

Single Answer

19

The addition of HCN to acetone forms cyano hydrin. It is an example of reaction

( )

Electrophilic substitution

( )

Nucleophilic substitution

( )

Nucleophilic addition

( )

Electrophilic addition

Single Answer

20

Ketones are less reactive than aldehydes because

( )

Alkyl groups are electron donating

( )

Ketone are non polar

( )

None of these

( )

Steric hindrance is greater in ketone

Single Answer

21

Aldehydes are reducing agents. In reaction with fehling solution they reduce

( )

Ag+ ions

( )

Tartaric acid

( )

NaOH

( )

Cu+2 ions

Single Answer

22

When two moles of ethanal react in the presence of NaOH, 3-hydroxy butanal is formed. This reaction is called

( )

Wurtz reaction

( )

Cannizaro reaction

( )

Hoffmanns' reaction

( )

Aldol condensation

Single Answer

23

Isopropyl alcohol on oxidation forms

( )

Ethylene

( )

Acetaldehyde

( )

Acetone

( )

Ether

Single Answer

24

Calcium acetate when dry distilled gives

___________________________________

Fill In the Blank

25

Which of the following alcohol cannot be produced by treating aldehyde or ketones with NaBH4 or LiAlH4?

( )

2-propanol

( )

Ethanol

( )

2-methyl-2-propanol

( )

1-propanol

Single Answer

26

Tollens reagent is

___________________________________

Fill In the Blank

27

Propyne on hydrolysis in presence of H2SO4 and HgSO4 gives

( )

Acetaldehyde

( )

Acetone

( )

Formaldehyde

( )

None of these

Single Answer

28

Aldehydes are produced in atmosphere by

( )

Reaction of oxygen atoms with ozone

( )

Reaction of oxygen atoms with hydrocarbons

( )

Oxidation of secondary alcohols

( )

Reduction of alkenes

Single Answer

29

On heating acetaldehyde with ammonical silver nitrate, we get

( )

Silver acetate

( )

Silver mirror

( )

HCHO

( )

CH3OH

Single Answer

30

Cannizzaro reaction is not given by

( )

Trimethyl acetaldehyde

( )

Formaldehyde

( )

Acetaldehyde

( )

Benzaldehyde

Single Answer

31

At room temperature formaldehyde is

( )

Gas

( )

Solid

( )

Liquid

Single Answer

32

Which of the following does not turn schiff's reagent to pink?

( )

Formaldehyde

( )

Benzaldehyde

( )

Methyl chloride

( )

Acetone

Single Answer

33

The compound obtained by the reduction of propionaldehyde by amalgamated zinc and conc.HCl is

( )

Propanol

( )

Propane

( )

Propene

( )

All these

Single Answer

34

Aromatic aldehydes undergo disproportionation in presence of sodium or potassium hydroxide to give corresponding alcohol and acid. The reaction is known as

( )

Wurtz reaction

( )

Friedel craft reaction

( )

Claisen reaction

( )

Cannizzaro reaction

Single Answer

35

Aldehydes can be distinguished from ketones by using

( )

Resorcinol

( )

Conc.H2SO4

( )

Anhy.ZnCl2

( )

Schiff's reagent

Single Answer

36

Which of the following gives iodoform on heating with solution of I2 containing Na2CO3?

( )

Methyl alcohol

( )

Acetone

( )

Ethyl alcohol as well as acetone

( )

Ethyl alcohol

Single Answer

37

Wacker method involves the conversion of alkene using PdCl2 into corresponding

( )

Ether

( )

Aldehyde

( )

Ketone

( )

Alcohol

Single Answer

38

Which of the following is hypnotic?

( )

Acetaldehyde

( )

Metaldehyde

( )

Paraldehyde

( )

None

Single Answer

39

When vapours of isopropyl alcohol are passed over heated copper, the major product obtained is

( )

Acetaldehyde

( )

Propylene

( )

Propane

( )

Acetone

Single Answer

40

A nucleophilic reagent will readily attack

( )

Ethylamine

( )

Ethylene

( )

Ethanol

( )

Ethanal

Single Answer

41

Which of the following does not react with phenyl hydrazine?

( )

Acetone

( )

Ethanal

( )

Acetophenone

( )

Ethanol

Single Answer

42

Self condensation of acetaldehyde in the presence of dilute alkalies gives

( )

Mesitylene

( )

An acetal

( )

Propionaldehyde

( )

An aldol

Single Answer

43

A compound A has a molecular formula C2Cl3OH. It reduces fehling solution and on oxidation produces a monocarboxylic acid B. A can also be obtained by the action of Cl2 on ethanol. A is

( )

Chloroacetic acid

( )

Chloral hydrate

( )

CHCl3

( )

CH3Cl

Single Answer

44

Acetone is prepared by

( )

Oxidation of n-propyl alcohol

( )

Pyrolysis of calcium acetate

( )

Pyrolysis of calcium acetate as well as acetic acid

( )

Oxidation of acetaldehyde

Single Answer

45

Which of the following does not give brick red ppt. with fehling solution?

( )

Acetaldehyde

( )

D-glucose

( )

Acetone

( )

Formalin

Single Answer

46

Formalin is

___________________________________

Fill In the Blank

47

A compound possessing alpha-hydrogen atom, in the presence of dilute alkali forms beta-hydroxy aldehyde. This product on heating with dilute acid forms an unsaturated crotonaldehyde. The compound is

( )

CH3CH2CHO

( )

HC=_C-CHO

( )

CH2=CH-CHO

( )

CH3CHO

Single Answer

48

Reduction of aldehydes with HI and P give

___________________________________

Fill In the Blank

49

Cyanohydrin of which of the following forms lactic acid

( )

CH3CHO

( )

HCHO

( )

CH3CH2CH2CHO

( )

CH3COCH3

Single Answer

50

Which of the following compounds does not react with NaHSO3?

( )

Acetone

( )

Acetaldehyde

( )

C6H5CHO

( )

Acetophenone

Single Answer

51

Acetal is produced by reacting alcohol in presence of dry HCl with

( )

Ether

( )

Acetaldehyde

( )

Carboxylic acid

( )

Ketone

Single Answer

52

Which of the following compounds gives a ketone with Grignard's reagent?

( )

Methyl iodide

( )

Ethanenitrile

( )

Formaldehyde

( )

Ethyl alcohol

Single Answer

53

Acetone is oxidized with

( )

Fehlinf solution

( )

Tollen's reagent

( )

Benedicts solution

( )

Acidic dichromate solution

Single Answer

54

Reduction with aluminium isopropoxide in excess of isopropyl alcohol is called Meerwein Ponndorff-Verley reduction (MPV). What will be the final product when cyclohex-2-enone is selectively reduces in MPV reduction?

( )

Cyclohexanol

( )

Cyclohexanone

( )

Cyclohex-2-enol

( )

Benzene

Single Answer

55

Reductive ozonolysis of benzene produces

( )

Acetone

( )

Maleic acnhydride

( )

Phthalic acid

( )

Glyoxal

Single Answer

56

Concentrated sodium hydroxide and benzaldehyde react to produce

( )

Benzyl alcohol

( )

Benzophenone

( )

Hydrobenzamide

( )

Cinnamic acid

Single Answer

57

Wolf-Kishner reduction is used for the reduction of

( )

Nitro compounds

( )

Carbonyl compounds

( )

Carboxylic acids

( )

Olefins

Single Answer

58

Which of the following is method of converting a unsaturated ketone into unsaturated hydrocarbon?

( )

Cannizzaro's reaction

( )

Reimer Tiemann reaction

( )

Wolf-Kishner reduction

( )

Aldol condensation

Single Answer

59

IUPAC name of acetone is

___________________________________

Fill In the Blank

60

In which reaction aromatic aldehyde is treated with acid anhydride in the presence of corresponding salt of the acid to give unsaturated aromatic acid?

( )

Friedel-Crafts reaction

( )

Perkin's reaction

( )

Wurtz reaction

( )

None of these

Single Answer

61

C2H5CHO and (CH3)2CO can be distinguished by testing with

( )

Hydroxylamine

( )

Phenyl hydrazine

( )

Fehling solution

( )

Sodium bisulphate

Single Answer

62

If formaldehyde and KOH are heated then we get

( )

Acetylene

( )

Ethyl formate

( )

Methane

( )

Methyl alcohol

Single Answer

63

Clemensen's reduction of ketones is carried out in

( )

LiAlH4 in water

( )

Glycol with KOH

( )

H2 with Pd catalyst

( )

Zn-Hg with conc.HCl

Single Answer

64

Which of the following organic compounds exhibits positive Fehling test as well as Iodoform test?

( )

Propanone

( )

Ethanal

( )

Ethanol

( )

Methanal

Single Answer

65

Chromyl chloride and toluene react to produce

___________________________________

Fill In the Blank

66

The addition of HCN to carbonyl compounds is an example of

( )

Electrophilic addition

( )

Nucleophili substitution

( )

Electrophilic substitution

( )

Nucleophilic addition

Single Answer

67

From which of the following tertiary butyl alcohol is obtained by the action of methyl magnesium iodide?

( )

CH3CHO

( )

CH3COCH3

( )

CO2

( )

HCHO

Single Answer

68

Aldol condensation will not be observed in

( )

Phenyl acetaldehyde

( )

Chloral

( )

Ethanal

( )

Hexanal

Single Answer

69

Benzophenone can be converted into benzene using

( )

Acidified dichromate

( )

Sodium amalgam in water

( )

Anhydrous AlCl3

( )

Fused alkali

Single Answer

70

Which of the following is incorrect?

( )

Tollen's reagent is used in the detection of unsaturation

( )

Fehling solution is used in the detection of glucose

( )

FeCl3 is used in the detection of phenols

( )

NaHSO3 is used in the detection of carbonyl compounds

Single Answer

71

Which of the following react with NaOH to produce an acid and an alcohol?

( )

C6H5COOH

( )

Ch3COOH

( )

CH3CH2COOH

( )

NCHO

Single Answer

72

Which of the following reagent is used to distinguish acetone and acetophenone?

( )

NaHSO3

( )

NH4Cl

( )

Na2SO4

( )

Grignard's reagent

Single Answer

73

An organic compound 'A' has the molecular formula C3H6O, it undergoes iodoform test. When saturated with HCl it gives 'B' of molecular formula C9H14O. A and B are

( )

Propanone and mesityl oxide

( )

Propanone and mesitylene oxide

( )

Propanone and 2,6-dimethyl-2,5-heptadien-4-one

( )

Propanal and mesitylene

Single Answer

74

Which is not true about acetophenone?

( )

On oxidation with alkaline KMnO4 followed by hydrolysis gives benzoic acid

( )

Reacts to form 2,4-dinitrophenyl hydrazine

( )

Reacts with I2/NaOH to form iodoform

( )

Reacts with Tollen's reagent to form silver mirror

Single Answer

75

The IUPAC name of CH3COCH(CH3)2 is

___________________________________

Fill In the Blank

76

Aniline reacts with which of these to form Schiff base?

( )

Acetic acid

( )

Acetone

( )

Benzaldehyde

( )

NH3

Single Answer

77

Hydrogenation of benzoyl chloride in presence of Pd on BaSO4 gives

( )

Benzaldehyde

( )

Benzoic acid

( )

Phenol

( )

Benzyl alcohol

Single Answer

78

Distillation of calsium salts of acetic acid and formic acid gives acetaldehyde. What compound is obtained if only calsium salt of acetic acid is distilled?

( )

Butyraldehyde

( )

Formaldehyde

( )

Acetone

( )

Propionaldehyde

Single Answer

79

Acetaldehyde can be converted to lactic acid by two reactions. What are they

( )

Treatment with HCN followed by reduction

( )

Oxidation of acetaldehyde followed by basic hydrolysis

( )

Treatment with HCN followed by acid hydrolysis

( )

Treatment with HCN followed by oxidation

Single Answer

80

Aldol condensation is a reaction of cold dilute solution of alkali with

( )

All ketones

( )

All aldehydes

( )

Aldehydes and ketones with alpha-hydrogen

( )

Aldehydes with alpha-hydrogen

Single Answer

81

NaOH reacts with formaldehyde to give methanol as one of the products, in a cannizzaro's reaction. What is the other product?

( )

HCOO-

( )

HCOOH

( )

CH3COO-Na+

( )

CH3COOH

Single Answer

82

Which test will not distinguish between benzaldehyde and acetophenone?

( )

Silver mirror test

( )

Benedicts solution

( )

2,4-DNPH test

( )

Fehling solution

Single Answer

83

Sodium borohydride can be used to change acetaldehyde to

( )

Ethanol

( )

Acetone

( )

Methanol

( )

Acetic acid

Single Answer

84

Which of the following will have the highest boiling point?

( )

2-hexanone

( )

Propanal

( )

Ethanol

( )

Methanol

Single Answer

85

Ketones are prepared by oxidation of

( )

Primary alcohols

( )

Secondary alcohols

( )

Tertiary alcohols

( )

None of these

Single Answer

86

Which of the following will not give iodoform test on treatment with I2/NaOH?

( )

3-pentanone

( )

Acetaldehyde

( )

Butanone

( )

Acetone

Single Answer

87

Cannizzaro's reaction is not given by

( )

Formaldehyde

( )

Acetaldehyde

( )

Benzaldehyde

( )

Trimethylacetaldehyde

Single Answer

88

Aldehydes are oxidation product of

( )

S-alcohols

( )

P-alcohols

( )

Ter-alcohols

( )

Carboxylic acids

Single Answer

89

Which one of the following compounds will give a precipitate for iodoform when reacted with iodine and NaOH?

( )

C6H5CHO

( )

CH3CH2CH(OH)CH3

( )

(CH3)3COH

( )

CH3COOH

Single Answer

90

For which one of the following pairs of compounds can the members be distinguished by means of Tollen's test?

( )

HCHO and CH3CHO

( )

CH3CHO and CH3COCH

( )

CH3COCH3 and C6H5COCH3

Single Answer

91

Almond essence is used to flavour food. A student tested a sample of almond essence using 2,4-DNP reagent and obtained coloured crystals which had a sharp melting point. Which class of compounds gives this test?

( )

Carboxylic acids

( )

Aldehydes

( )

Amines

( )

Alcohol

Single Answer

92

The product of the reaction between propanone and HCN is hydrolysed under acidic conditions. What is the formula of the final product?

( )

CH3CH(OH)COOH

( )

(CH3)2C(OH)COOH

( )

CH3CH2CH2COOH

( )

CH3CH2CH(OH)COOH

Single Answer

93

An organic compound has following properties; it gives a positive tri-iodomethane test, it gives yellow ppt. with 2,4-DNP reagent, it does not react with Tollen's reagent. Which compound would give these results?

( )

CH3CH2CH2CHO

( )

CH3CH2OH

( )

CH3CHO

( )

CH3CH2COCH3

Single Answer

94

When propanal reacts with Tollen's reagent, what are the principle inorganic and organic products formed?

( )

Ag and CH3CHO

( )

Ag and CH3CH2COOH

( )

Ag and CH3CH2CH2OH

( )

Ag2O and CH3CH2COOH

Single Answer

95

Which one of the following is a product of the reaction between C6H5CH2OH and CH3COCl?

( )

C6H55CH2Cl

( )

C6H5OCCOCH3

( )

C6H5CH2COCl

( )

C6H5CH2OCOCH3

Single Answer

96

Aldol condensation can occur

( )

Between two identical or different aldehydes

( )

Between two identical or different ketone

( )

Between aldehyde and ketone having a-hydrogen atom

( )

All of these

Single Answer

97

Aldol condensation is actually

( )

Electrophilic addition of carbonium ion

( )

Nucleophilic addition of carbonation

( )

Electrophilic addition of carbonation

( )

Nucleophilic addition of carbonium ion

Single Answer

98

Which of the following statement is wrong?

( )

Aldehydes undero reduction to form primary alcohols while ketones undergo reduction to form secondary alcohols

( )

Aldehydes undergo oxidation to form acids having less number of carbon atoms while ketones undero oxidation to form acids havin same number of carbon atoms

( )

Aldehydes can undergo polymerization while ketone cannot undergo polymerization

( )

Aldehydes give positive silver mirror test while ketones give negative-mirror test

Single Answer

99

Acid catalysed reaction of aldehydes with alcohols produces

( )

Enol

( )

Aldol

( )

Ester

( )

Acetal

Single Answer

100

Condensation between two aldehydes in aluminium ethoxide joining a-H and carbonyl carbon of one aldehyde to carbonyl carbon and carbonyl oxygen of the other is called

( )

Claisen Schmidt condensation

( )

Aldol condensation

( )

Tischenko reaction

( )

Cannizzaro's reaction

Single Answer

101

Tischenko reaction results in

( )

Imine

( )

Aldol

( )

Ester

( )

Enamine

Single Answer

102

Condensation of aldehyde with acid anhydride in presence of salt catalyst to produce cinnamic acid is called

( )

Reformatsky reaction

( )

Perkin's condensation

( )

Knovenagel reaction

( )

Claisen condensation

Single Answer