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

  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


  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

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