Carbonyl Compounds MCQs [Organic Chemistry]

MCQs-based questions and answers on Carbonyl Compounds in organic chemistry.

Which reagent will react with both aldehyde and ketone?

  1. Grignard reagent
  2. Sodium nitroprusside
  3. Fehling’s reagent
  4. Tollen’s reagent

Question’s Answer: Sodium nitroprusside


Acetone can be converted into pinacol by

  1. Na/Hg
  2. Zn/Hg
  3. Mg/Hg
  4. All of these

Question’s Answer: Mg/Hg


Which compounds will not give iodoform test on treatment with I2/NaOH?

  1. 2-Butanone
  2. 3-Pentanone
  3. Acetone
  4. Acetaldehyde

Question’s Answer: 2-Butanone


Crabonyl compounds react hydroxylamine to form  ___________ .

  1. Hyrazone
  2. Cyanohydrin
  3. Oxime
  4. None of these

Question’s Answer: Oxime


Which test is not given by aldehyde?

A Sodium nitroprusside test

  1. Fehling solution test
  2. 2.4-DNP test
  3. NaHSO3 test

Question’s Answer: Sodium nitroprusside test


Paraldehyde is helpful and used as_________.

  1. Poison
  2. Dye
  3. Polymer
  4. Medicine

Question’s Answer: Medicine


The correct order of reactivity of CH3CHO, C₂H3COCH, and CH3COCH3 is

  1. CH3COCH > CH3CHO> C₂H5COCH3
  2. C₂H3COCH > CH3COCH3 > CH3CHO
  3. CH3CHO > CH3COCH3 > CH3COC2H5
  4. CH3COCH3 > C2H5COCH3 > CH3CHO

Question’s Answer: CH3CHO > CH3COCH3 > CH3COC2H5


Which has most acidic hydrogen?

  1. hexanone
  2. 2,3-hexanedione
  3. 2,5-hexanedione
  4. Hexanedione

Question’s Answer: Hexanedione


Industrial production of acetaldehyde is done by

  1. Oxidation of ethanol
  2. Oxidation of ethylene in the presence of
  3. Reduction of acetic acid
  4. Hydration of acetylene

Question’s Answer: Oxidation of ethylene in the presence of


In Which compounds, carbon number is decreased during oxidation

  1. Formaldehydec
  2. Aldehyde
  3. Ketone
  4. Ethanol

Question’s Answer: Ketone


Which will not show haloform reaction?

  1. CH3CHO
  2. C6H5CHO
  3. CH3COCH3
  4. C6H5COCH3

Question’s Answer: C6H5CHO


What is a mixed ketone?

  1. Acetone
  2. Diethyl ketone
  3. Benzophenone
  4. Acetophenone

Question’s Answer: Acetophenone


Which aldehydes is most reactive?

  1. HCHO
  2. CH3CHO
  3. C2H5CHO
  4. C6H5CHO

Question’s Answer: HCHO


The condensation between formaldehyde and acetaldehyde in the presence of conc. NaOH and heat gives

  1. Mixture of CH3CH2OH and HCOONa+
  2. Mixture of CH3OH and CH3COONa+
  3. Acrolein
  4. None of these

Question’s Answer: Acrolein


The reagent which can be helpful and used to distinguish acetophenone from benzophenone is

  1. 2,4-dinito phenyl hydrazine
  2. I2 and NaOH
  3. Benedict reagent
  4. LIAIH4

Question’s Answer: I2 and NaOH


Ketones are prepared by the oxidation of

  1. 1° Alcohol
  2. 3° Alcohol
  3. 2° Alcohol
  4. None of these

Question’s Answer: 2° Alcohol


When a formaldehyde solution is evaporated to dryness, a white crystalline solid is obtained. This is known as

  1. Formose
  2. Hexa methylene tetramine
  3. Trioxy methylene
  4. Para formaldehyde

Question’s Answer: Para formaldehyde


Which does not give Cannizzaro’s reaction?

  1. Benzophenone
  2. Benzaldehyde
  3. Acetaldehyde
  4. Formaldehyde

Question’s Answer: Acetaldehyde


The C-atom in aldehyde and ketone is _________ hybridized

  1. sp3
  2. sp
  3. dsp
  4. sp2

Question’s Answer: sp2


Which is least reactive?

  1. C2H3CHO

B C6H5CHO

  1. CH3CHO
  2. HCHO

Question’s Answer: C6H5CHO


Schiff’s reagent gives pink color with ________.

  1. Acetic acid
  2. Acetone
  3. Acetaldehyde
  4. Methyl acetate

Question’s Answer: Acetaldehyde


Which tests issued to distinguish between aldehyde and ketone?

  1. Fehling solution test
  2. Schiff reagent test
  3. Tollen’s reagent test
  4. Sodium nitroprusside test

Question’s Answer: Sodium nitroprusside test


Which will undergo nucleophilic addition reaction more easily?

  1. Amines
  2. Aldehyde
  3. Ketone
  4. Alkene

Question’s Answer: Aldehyde


Aldol consists of

  1. Hydroxyl group
  2. Aldehyde group
  3. Carboxylic group
  4. Both A and B

Question’s Answer: Hydroxyl group


Calcium formate on dry distillation yields

  1. Formaldehyde
  2. Acetaldehyde
  3. Formic acid
  4. Ketone

Question’s Answer: Ketone


Which reactions is not given by acetone?

  1. Iodoform reaction
  2. Reduction of Fehling’s solution
  3. Formation of an addition compound with sodium hydrogen sulfite
  4. Formation of crystals with 2,4-dinitrophenyl hydrazine

Question’s Answer: Reduction of Fehling’s solution


Which is the strongest reducing agent?

  1. C3H7OH
  2. CH3COCH3
  3. HCHO
  4. C₂H5OH

Question’s Answer: HCHO


What will happened, hen aldehyde reacts with Tollen’s reagent?

  1. A ketone is formed
  2. An alcohol is formed
  3. Ag ions are reduced
  4. Ag+ ions are produced

Question’s Answer: Ag ions are reduced


The red brown ppt of Fehling solution and Benedict solution tests are of ______.

  1. AgBr
  2. Cu₂O
  3. Cuo
  4. Ag

Question’s Answer: Cu₂O


Ketone on reduction produces which of the following?

  1. Secondary alcohol
  2. Primary alcohol
  3. Tertiary alcohol

D Acetic acid

Question’s Answer: Secondary alcohol


Which statements regarding carbonyl group is not correct?

  1. The aryl group in aromatic aldehydes speeds up the addition reaction across the carbonyl group
  2. The carbon atom of carbonyl group in the transition state formed during the addition reaction across the carbonyl group is sp3 hybridized
  3. The carbon atom of carbonyl group in aldehydes is sp2 hybridized
  4. An aryl group stabilizes the aldehyde more than the transition state

Question’s Answer: The aryl group in aromatic aldehydes speeds up the addition reaction across the carbonyl group


Reactivity of carbonyl compounds is

  1. Electrophilic carbon
  2. Unsaturation
  3. Less steric hindrance
  4. All of these

Question’s Answer: All of these

More Organic chemistry MCQs

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  4. Carbonyl Compounds MCQs
  5. Halogenated Organic Compounds MCQs
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