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ChemTech (Organic Chem) > Condensation Reactions > Flashcards

Condensation Reactions Flashcards

1
Q
  1. Condensation reaction is the reverse of which of the
    following reaction?
    a) lock and key hypothesis
    b) oxidation
    c) hydrolysis
    d) glycogen formation
A

c) hydrolysis

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2
Q
  1. Condensation reaction always results in the formation
    of complex sugar (disaccharide or polysaccharide) and
    which of the following?
    a) amino acids
    b) lipids
    c) water
    d) maltose
A

c) water

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2
Q
  1. In which condensation an enol or an enolate ion reacts
    with a carbonyl compound to form a β-hydroxyaldehyde
    or β-hydroxyketone (an aldol reaction), followed by
    dehydration to give a conjugated enone happens?
    a) Aldol condensation
    b) Claisen reduction
    c) Henry condensation
    d) Knoevenagel condensation
A

a) Aldol condensation

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2
Q
  1. Which of the following statements is wrong?
    a) The base-catalysed α-halogenation of propanone is first order in the concentration of the base
    b) The rate constant for the base-catalysed α-halogenation
    of propanone decreases in the order Cl2 > Br2 > I2
    c) The base-catalysed α-halogenation of propanone
    proceeds easily to give 1,1,1-trihalopropanone
    d) Polyhalogenation of propanone is difficult under acidic
    conditions, but the products are the same as those
    obtained under basic conditions
A

b) The rate constant for the base-catalysed α-halogenation
of propanone decreases in the order Cl2 > Br2 > I2

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3
Q
  1. Which of the following statements is wrong?
    a) Hydrolysis of an acetal is catalysed by acids
    b) Hydrolysis of an acetal is catalysed by aqueous acid
    c) Oximes are stabilized by conjugation between the C=N
    and OH groups
    d) Enamines are formed between secondary amines and
    the carbonyl group of aldehydes and ketones
A

b) Hydrolysis of an acetal is catalysed by aqueous acid

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4
Q
  1. Acetal on acid hydrolysis generates which of the
    following?
    a) Alcohol
    b) Amine and aldehyde
    c) Ketone and alcohol
    d) Ketone and ether
A

c) Ketone and alcohol

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5
Q
  1. Dimethoxymethane is dimethyl acetal of which of the
    following?
    a) Formaldehyde
    b) Acetaldehyde
    c) Tolualdehyde
    d) Propionaldehyde
A

a) Formaldehyde

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5
Q
  1. Which of the following is not polyacetal?
    a) Dimethoxymethane
    b) Dioxolane
    c) Starch
    d) Cellulose
A

d) Cellulose

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6
Q
  1. In keto-enol from presence of which type of hydrogen is
    must?
    a) Alpha
    b) Beta
    c) Gamma
    d) Any position of hydrogen
A

a) Alpha

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7
Q
  1. Which of the following tautomeric form is more stable?
    CH3-CH=O ↔ CH2=C-OH
    (I) (II)
    a) I
    b) II
    c) Both are equally stable
    d) Both are unstable
A

a) I

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7
Q
  1. Hydrolysis of CH3CH2NO2 with 85% H2SO4 gives which of
    the following compound?
    a) CH3CH2OH
    b) C2H6
    c) CH3CH=NOH
    d) CH3COOH
A

d) CH3COOH

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7
Q
  1. Acetic acid is obtained when which of the given reaction
    takes place?
    a) Methyl alcohol is oxidised with potassium
    permanganate
    b) Calcium acetate is distilled in the presence of calcium
    formate
    c) Acetaldehyde is oxidised with potassium dichromate
    and sulphuric acid
    d) Glycerol is heated with sulphuric acid
A

c) Acetaldehyde is oxidised with potassium dichromate
and sulphuric acid

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8
Q
  1. Acetic acid is manufactured by the fermentation of
    which of the following reaction?
    a) Ethanol
    b) Methanol
    c) Ethanal
    d) Methanal
A

a) Ethanol

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9
Q
  1. When benzyl alcohol is oxidised with KMnO4, the
    product obtained is which of the following compound?
    a) Benzaldehyde
    b) Benzoic acid
    c) CO2 and H2O
    d) Benzophenone
A

a) Benzaldehyde

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9
Q
  1. Which of the following gives benzoic acid on oxidation?
    a) Chlorophenol
    b) Chlorotoluene
    c) Chlorobenzene
    d) Benzyl chloride
A

d) Benzyl chloride

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9
Q
  1. Formic acid is obtained when which of the given
    reaction occurs?
    a) Calcium acetate is heated with conc. H2SO4
    b) Calcium formate is heated with calcium acetate
    c) Glycerol is heated with oxalic acid at 110℃
    d) Acetaldehyde is oxidised with K2Cr2O7 and H2SO4
A

c) Glycerol is heated with oxalic acid at 110℃

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10
Q
  1. o-xylene when oxidised in presence of V2O5 the product
    is which carboxylic acid?
    a) Benzoic acid
    b) Phenyl acetic acid
    c) Phthalic acid
    d) Acetic acid
A

c) Phthalic acid

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10
Q
  1. By aerial oxidation, which one of the following gives
    phthalic acid?
    a) Naphthalene
    b) Benzene
    c) Mesitylene
    d) Toluene
A

a) Naphthalene

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11
Q
  1. Which of the following acids has the smallest
    dissociation constant?
    a) CH3CHFCOOH
    b) FCH2CH2COOH
    c) BrCH2CH2COOH
    d) CH3CHBrCOOH
A

c) BrCH2CH2COOH

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12
Q
  1. The vapour of a carboxylic acid HA when passed over
    MnO2 at 573 K yields propanone. What is the acid HA?
    a) Methanoic acid
    b) Ethanoic acid
    c) Propanoic acid
    d) Butanoic acid
A

b) Ethanoic acid

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13
Q
  1. Which acid is strongest or Which is most acidic?
    a) Cl2CH.COOH
    b) ClCH2COOH
    c) CH3COOH
    d) Cl3C.COOH
A

b) ClCH2COOH

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13
Q
  1. The acid which reduces Fehling solution is which of the
    following?
    a) Methanoic acid
    b) Ethanoic acid
    c) Butanoic acid
    d) Propanoic acid
A

a) Methanoic acid

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14
Q
  1. Which class of compounds shows H-bonding even more
    than in alcohols?
    a) Phenols
    b) Carboxylic acids
    c) Ethers
    d) Aldehydes
A

b) Carboxylic acids

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15
Q
  1. Which of the following is the strongest acid?
    a) CH3COOH
    b) BrCH2COOH
    c) ClCH2COOH
    d) FCH2COOH
A

d) FCH2COOH

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16
Q
  1. The reaction of HCOOH with conc.H2SO4 gives which of
    the following compound?
    a) CO2
    b) CO
    c) Oxalic acid
    d) Acetic acid
A

b) CO

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17
Q
  1. Which one is strongest acid among following options?
    a) CH2FCOOH
    b) CH2ClCOOH
    c) CHCl2COOH
    d) CHF2COOH
A

b) CH2ClCOOH

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17
Q
  1. Acetic acid is weak acid than sulphuric acid because
    which of the following reasons?
    a) It decomposes on increasing temperature
    b) It has less degree of ionisation
    c) It has -COOH group
    d) It has more inductive effect
A

b) It has less degree of ionisation

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18
Q
  1. In CH3COOH and HCOOH, HCOOH will be which of the
    following?
    a) Less acidic
    b) Equally acidic
    c) More acidic
    d) cannot say about acidic behaviour
A

c) More acidic

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19
Q
  1. Hydrogenation of C6H5CHOH−COOH over
    Rh−Al2O3catalyst in methanol gives which of the following?
    a) C6H5CH2COOH
    b) C6H11CHOHCOOH
    c) C6H5CHOHCH2OH
    d) C6H11CH2COOH
A

b) C6H11CHOHCOOH

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19
Q
  1. In the anion HCOO− the two carbon-oxygen bonds are
    found to be of equal length. What is the reason for it?
    a) Electronic orbitals of carbon atom are hybridised
    b) The C = O bond is weaker than the C – O bond
    c) The anion HCOO− has two resonating structures
    d) The anion is obtained by removal of a proton form the
    acid molecule
A

b) The C = O bond is weaker than the C – O bond

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20
Q
  1. Carboxylic acids are more acidic than phenol and alcohol
    because of which of the following?
    a) Intermolecular hydrogen bonding
    b) Formation of dimers
    c) Highly acidic hydrogen
    d) Resonance stabilization of their conjugate base
A

d) Resonance stabilization of their conjugate base

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21
Q
  1. When propionic acid is treated with aqueous sodium
    bicarbonate CO2 is liberated. The ‘C’ of CO2 comes from
    which of the following?
    a) Methyl group
    b) Carboxylic acid group
    c) Methylene group
    d) Bicarbonate
A

d) Bicarbonate

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22
Q
  1. The compound not soluble in acetic acid is which of the
    following?
    a) CaCO3
    b) CaO
    c) CaC2O4
    d) Ca(OH)2
A

c) CaC2O4

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23
Q
  1. Identify the wrong statement from the following?
    a) Salicylic acid’s a monobasic acid
    b) Methyl salicylate is an ester
    c) Salicylic acid gives violet colour with neutral ferric
    chloride as well as brisk effervescence with sodium
    bicarbonate
    d) Methyl salicylate does not occur in natural oils
A

d) Methyl salicylate does not occur in natural oils

23
Q
  1. When CH3COOH reacts with CH3−Mg−X, which of the
    following is formed?
    a) CH3COX is formed
    b) Hydrocarbon is formed
    c) Acetone is formed
    d) Alcohol is formed
A

b) Hydrocarbon is formed

24
Q
  1. Hydrolysis of an ester gives a carboxylic acid which on
    Kolbe’s electrolysis yields ethane. The ester is which of the
    following?
    a) Ethyl methonoate
    b) Methyl ethanoate
    c) Propylamine
    d) Ethylamine
A

b) Methyl ethanoate

24
Q
  1. Sulphonation of benzoic acid produces mainly which of
    the following?
    a) o-sulphobenzoic acid
    b) m-sulphobenzoic acid
    c) p-sulphobenzoic acid
    d) o- and p-sulphobenzoic acid
A

b) m-sulphobenzoic acid

24
Q
  1. Benzoyl chloride is prepared from benzoic acid by which
    of the following?
    a) Cl2, hv
    b) SO2, Cl2
    c) SOCl2
    d) Cl2, H2O
A

b) SO2, Cl2

25
Q
  1. When formic acid reacts with PCl5 it forms which of the
    following?
    a) Formyl chloride
    b) Acetyl chloride
    c) Methyl chloride
    d) Propionyl chloride
A

a) Formyl chloride

26
Q
  1. Laboratory method for the preparation of acetyl
    chloride is which of the following?
    a) CH3COOH + SOCl2→CH3COCl
    b) CH3COOH + PCl3→CH3COCl
    c) CH3COONa + PCl3→CH3COCl
    d) CH3COONa + PCl3→CH5COCl
A

a) CH3COOH + SOCl2→CH3COCl

27
Q
  1. Which of the following is the product B when acid
    chloride reacts with alcohol?
    RCOCl + R′OH → B + HCl
    a) Chlorophenol
    b) Ester
    c) Ether
    d) Acetyl chloride
28
Q
  1. Which of the following gives benzoic acid on oxidation?
    a) Chlorophenol
    b) Chlorotoluene
    c) Chlorobenzene
    d) Benzyl chloride
A

d) Benzyl chloride

29
Q
  1. What will be the product B in the given reaction?
    2 C6H5COCl + H2O2 + 2 NaOH → B + 2 NaCl + 2 H2O
    a) Chlorophenol
    b) Chlorotoluene
    c) Chlorobenzene
    d) Benzyl peroxide
A

d) Benzyl peroxide

30
Q
  1. What will be the reactivity order of the following with
    water?
    a) acid halide > ester > acid anhydride > amide
    b) acid anhydride > amide > acid halide > ester
    c) amide > ester > acid anhydride > acid halide
    d) acid halide > acid anhydride > ester > amide
A

d) acid halide > acid anhydride > ester > amide

30
Q
  1. For synthesis of carboxylic acid, the intermediate
    product needed is which of the following?
    a) Acyl chloride
    b) aryls
    c) benzene
    d) carboxylic acid
A

a) Acyl chloride

31
Q
  1. What is the product D in the given reaction?
    C6H5CCl3 + C6H5CO2H → 2 C6H5COCl + D
    a) Cl2
    b) H2O
    c) HCl
    d) H2
31
Q
  1. Which of the following compounds would be converted
    to acetic anhydride when treated with sodium acetate?
    a) Acetaldehyde
    b) Acetyl chloride
    c) Methyl acetate
    d) Acetamide
A

b) Acetyl chloride

32
Q
  1. Acetic anhydride is less reactive toward attack by a
    nucleophile than which of the following?
    a) Acetic acid
    b) Ethyl acetate
    c) Acetyl chloride
    d) Acetonitrile
A

c) Acetyl chloride

33
Q
  1. When acetamide is treated with HNO2, the gas is
    evolved which of the following?
    a) H2
    b) O2
    c) N2
    d) CH4
33
Q
  1. On heating acetamide in presence of P2O5, which of the
    following is formed?
    a) Ammonium acetate
    b) Acetonitrile
    c) NH3
    d) Methylamines
A

b) Acetonitrile

34
Q
  1. By refluxing unsubstituted amide with acid, it will yield
    which of the following product(s)?
    a) ammonia
    b) carboxylic acid
    c) nitrogen gas
    d) ammonia and carboxylic acid
A

d) ammonia and carboxylic acid

34
Q
  1. What is the formed product when acid anhydride is
    hydrolyzed?
    a) Aldehyde
    b) Ketone
    c) Alcohols
    d) Carboxylic acid
A

d) Carboxylic acid

34
Q
  1. Decreasing order of basicity of the given compound is
    which of the following?
    (1) CH3CONH2
    (2) CH3CH2NH2
    (3) PhCH2CONH2
    a) 1 > 2 > 3
    b) 2 > 1 > 3
    c) 3 > 2 > 1
    d) 1 > 3 > 2
A

b) 2 > 1 > 3

35
Q
  1. Which one of the following reducing agents is likely to
    be the most effective in bringing about the following
    change?
    R−CONH2 → RCH2NH2
    a) H2−Ni
    b) NaBH4
    c) LiAlH4
    d) Na-alcohol
A

a) H2−Ni

36
Q
  1. Ethyl amine on acetylation gives which of the following?
    a) N-ethyl acetamide
    b) Acetamide
    c) Methyl acetamide
    d) N,N-dimethyl acetamide
A

a) N-ethyl acetamide

36
Q
  1. Amides may be converted into amines by reaction
    named after which of the following reaction?
    a) Perkin
    b) Claisen
    c) Hoffmann
    d) Kolbe
A

c) Hoffmann

37
Q
  1. Benzamide on reaction with POCl3 gives which of the
    following?
    a) Aniline
    b) Chlorobenzene
    c) Benzyl amine
    d) Benzonitrile
A

d) Benzonitrile

37
Q
  1. What will be the product for the given reaction?
    CH3OH + CO →?
    a) Ethyl formate
    b) Methyl formate
    c) Ethyl acetate
    d) Methyl acetate
A

b) Methyl formate

38
Q
  1. Hydrolysis of ester leads to the formation of which of
    the following products in basic medium?
    a) Ether and alcohol
    b) Alcohol and sodium carboxylate
    c) Aldehyde and alcohol
    d) Sodium carboxylate
A

b) Alcohol and sodium carboxylate

39
Q
  1. Which of the following is used as catalyst for the
    esterification of carboxylic acid and alcohol?
    a) Nitrous acid
    b) Sulphuric acid
    c) Sulphurous acid
    d) Nitric acid
A

b) Sulphuric acid

40
Q
  1. Salts of carboxylate anions can be alkylating agent with
    alkyl halides to give esters. In the case that an alkyl
    chloride is used, an iodide salt can catalyze the reaction.
    What is the name reaction for the given reaction?
    a) Favorskii rearrangement
    b) Baeyer–Villiger oxidation
    c) Pinner reaction
    d) Finkelstein reaction
A

d) Finkelstein reaction

41
Q
  1. What will be the product for the given reaction?
    C2H4 + CH3CO2H + 1⁄2 O2 →?
    a) Ethyl formate
    b) Vinyl formate
    c) Ethyl acetate
    d) Methyl acetate
A

b) Vinyl formate

41
Q
  1. What is the characteristic smell for ester?
    a) Fruity like smell
    b) Fish like smell
    c) Rotten egg smell
    d) Alcoholic smell
A

a) Fruity like smell

42
Q
  1. Fries rearrangement reaction of phenol ester leads to
    the formation which type of product?
    a) Ketone
    b) Aldehyde
    c) Alcohol
    d) Alkene
43
Q
  1. What is the order or solubility in water of the following
    compound?
    1) ethyl methanoate
    2) ethyl butanoate
    3) ethyl ethanoate
    4) ethyl propanoate
    a) 1 > 2 > 3 > 4
    b) 1 > 3 > 4 > 2
    c) 1 > 2 > 4 > 3
    d) 3 > 1 > 4 > 2
A

b) 1 > 3 > 4 > 2

43
Q
  1. Which of the following is true about transesterification?
    a) exchanging the organic alkyl group of an ester with the
    organic group alkyl of an alcohol
    b) exchanging the organic alkyl group of an alcohol with
    the organic group alkyl of an ester
    c) exchanging the organic alkyl group of an ester with the
    organic group alkyl of an alkane
    d) exchanging the organic alkyl group of an ester with the
    organic group alkyl of an ether
A

a) exchanging the organic alkyl group of an ester with the
organic group alkyl of an alcohol

44
Q
  1. What is the geometry of the intermediate formed in the
    mechanism of transesterification?
    a) Octahedral
    b) Square planner
    c) Tetrahedral
    d) Square bipyramidal
A

c) Tetrahedral

44
Q
  1. What chemical reaction makes biodiesel?
    a) Transesterification
    b) Sublimation
    c) Polymerization
    d) Fermentation
A

a) Transesterification

45
Q
  1. Polyethylene terephthalate is prepared by a
    transesterification reaction.
    a) True
    b) False
46
Q
  1. Transesterification reaction is an irreversible reaction.
    a) True
    b) False
46
Q
  1. What type of solution is used in transesterification for
    the determination of fatty acid compositions?
    a) Methanol in NaOH
    b) Methanol in NaCl
    c) Methanol in KOH
    d) Methanol in H2O
A

a) Methanol in NaOH

46
Q
  1. Which of the following is the product formed when
    methyl ethanoate and ethanol in presence of hydrochloric
    acid?
    a) Ethyl ethanoate
    b) Methyl ethanoate
    c) Ethyl propanoate
    d) Propyl ethanoate
A

a) Ethyl ethanoate

47
Q
  1. Which of the following is the product formed when
    alkylene carbonate and alcohol in presence of hydrochloric
    acid?
    a) Dialkyl carbonate
    b) Methyl ethanoate
    c) Alkyl carbonate
    d) Propyl ethanoate
A

a) Dialkyl carbonate

47
Q
  1. Which of the following is the product formed when
    methyl propanoate and ethanol in presence of hydrochloric acid?
    a) Ethyl ethanoate
    b) Methyl ethanoate
    c) Ethyl propanoate
    d) Propyl ethanoate
A

c) Ethyl propanoate

48
Q
  1. Which of the following statement is true about
    saponification value of oil?
    a) The shorter the chain of fatty acid, the higher is the
    saponification value
    b) The shorter the chain of fatty acid, the higher is the
    saponification value
    c) The higher the saturation in chain of fatty acid, the
    lower is the saponification value
    d) The lower the saturation in chain of fatty acid, the
    higher is the saponification value
A

a) The shorter the chain of fatty acid, the higher is the
saponification value

48
Q
  1. Lye is used in soap-making. Lye is a concentrated
    solution of which ionic compound?
    a) K2CO3
    b) CuSO4
    c) NaOH
    d) NaCl
49
Q
  1. Which of the following is the product formed when
    butyl acetate and ethanol in presence of hydrochloric
    acid?
    a) Ethyl ethanoate
    b) Methyl acetate
    c) Ethyl acetate
    d) Propyl ethanoate
A

c) Ethyl acetate

50
Q
  1. Which of the following processes can saponification be
    used for?
    a) For the production of plastics
    b) In blow glass artistry
    c) To make soap
    d) The formation of alloys
A

c) To make soap

50
Q
  1. Which of the following is considered a useful alkali in
    saponification reactions?
    a) CCl4
    b) Cl–
    c) NaOH
    d) Pb+
51
Q
  1. Which of the following compound is an industrial
    manufacturing product by saponification?
    a) Sodium chloride
    b) Potassium hydroxide
    c) Glycerol
    d) Sodium hydroxide
A

c) Glycerol

51
Q
  1. Which of the following term describe saponification?
    a) Cleaving of ester molecules into carboxylic acid and
    alcohol
    b) Dehydration synthesis by removing water
    c) Hydrolysis of a salt by adding a weak acid
    d) Synthesis of two alkyl groups to make an ether
A

a) Cleaving of ester molecules into carboxylic acid and
alcohol

52
Q
  1. Saponification value is the number of milligrams of KOH
    required to saponify what present in the 1g of oil or fat?
    a) Salts
    b) Hydrocarbon
    c) Fatty acids
    d) unsaturation
A

c) Fatty acids

52
Q
  1. Which of the following fat or oil is unsaponifiable?
    a) Paraffin wax
    b) Bee wax
    c) Olive oil
    d) Shea butter
A

a) Paraffin wax

53
Q
  1. Soap can be precipitated out by salting by using which
    chemical compound?
    a) Sodium chloride
    b) Potassium hydroxide
    c) Glycerol
    d) Sodium hydroxide
A

a) Sodium chloride

ChemTech (Organic Chem) (11 decks)

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