MCQs-based questions and answers on Carbonyl Compounds in organic chemistry.
Which reagent will react with both aldehyde and ketone?
- Grignard reagent
- Sodium nitroprusside
- Fehling’s reagent
- Tollen’s reagent
Question’s Answer: Sodium nitroprusside
Acetone can be converted into pinacol by
- Na/Hg
- Zn/Hg
- Mg/Hg
- All of these
Question’s Answer: Mg/Hg
Which compounds will not give iodoform test on treatment with I2/NaOH?
- 2-Butanone
- 3-Pentanone
- Acetone
- Acetaldehyde
Question’s Answer: 2-Butanone
Crabonyl compounds react hydroxylamine to form ___________ .
- Hyrazone
- Cyanohydrin
- Oxime
- None of these
Question’s Answer: Oxime
Which test is not given by aldehyde?
A Sodium nitroprusside test
- Fehling solution test
- 2.4-DNP test
- NaHSO3 test
Question’s Answer: Sodium nitroprusside test
Paraldehyde is helpful and used as_________.
- Poison
- Dye
- Polymer
- Medicine
Question’s Answer: Medicine
The correct order of reactivity of CH3CHO, Câ‚‚H3COCH, and CH3COCH3 is
- CH3COCH > CH3CHO> Câ‚‚H5COCH3
- Câ‚‚H3COCH > CH3COCH3 > CH3CHO
- CH3CHO > CH3COCH3 > CH3COC2H5
- CH3COCH3 > C2H5COCH3 > CH3CHO
Question’s Answer: CH3CHO > CH3COCH3 > CH3COC2H5
Which has most acidic hydrogen?
- hexanone
- 2,3-hexanedione
- 2,5-hexanedione
- Hexanedione
Question’s Answer: Hexanedione
Industrial production of acetaldehyde is done by
- Oxidation of ethanol
- Oxidation of ethylene in the presence of
- Reduction of acetic acid
- Hydration of acetylene
Question’s Answer: Oxidation of ethylene in the presence of
In Which compounds, carbon number is decreased during oxidation
- Formaldehydec
- Aldehyde
- Ketone
- Ethanol
Question’s Answer: Ketone
Which will not show haloform reaction?
- CH3CHO
- C6H5CHO
- CH3COCH3
- C6H5COCH3
Question’s Answer: C6H5CHO
What is a mixed ketone?
- Acetone
- Diethyl ketone
- Benzophenone
- Acetophenone
Question’s Answer: Acetophenone
Which aldehydes is most reactive?
- HCHO
- CH3CHO
- C2H5CHO
- C6H5CHO
Question’s Answer: HCHO
The condensation between formaldehyde and acetaldehyde in the presence of conc. NaOH and heat gives
- Mixture of CH3CH2OH and HCOO–Na+
- Mixture of CH3OH and CH3COO–Na+
- Acrolein
- None of these
Question’s Answer: Acrolein
The reagent which can be helpful and used to distinguish acetophenone from benzophenone is
- 2,4-dinito phenyl hydrazine
- I2 and NaOH
- Benedict reagent
- LIAIH4
Question’s Answer: I2 and NaOH
Ketones are prepared by the oxidation of
- 1° Alcohol
- 3° Alcohol
- 2° Alcohol
- 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
- Formose
- Hexa methylene tetramine
- Trioxy methylene
- Para formaldehyde
Question’s Answer: Para formaldehyde
Which does not give Cannizzaro’s reaction?
- Benzophenone
- Benzaldehyde
- Acetaldehyde
- Formaldehyde
Question’s Answer: Acetaldehyde
The C-atom in aldehyde and ketone is _________ hybridized
- sp3
- sp
- dsp
- sp2
Question’s Answer: sp2
Which is least reactive?
- C2H3CHO
B C6H5CHO
- CH3CHO
- HCHO
Question’s Answer: C6H5CHO
Schiff’s reagent gives pink color with ________.
- Acetic acid
- Acetone
- Acetaldehyde
- Methyl acetate
Question’s Answer: Acetaldehyde
Which tests issued to distinguish between aldehyde and ketone?
- Fehling solution test
- Schiff reagent test
- Tollen’s reagent test
- Sodium nitroprusside test
Question’s Answer: Sodium nitroprusside test
Which will undergo nucleophilic addition reaction more easily?
- Amines
- Aldehyde
- Ketone
- Alkene
Question’s Answer: Aldehyde
Aldol consists of
- Hydroxyl group
- Aldehyde group
- Carboxylic group
- Both A and B
Question’s Answer: Hydroxyl group
Calcium formate on dry distillation yields
- Formaldehyde
- Acetaldehyde
- Formic acid
- Ketone
Question’s Answer: Ketone
Which reactions is not given by acetone?
- Iodoform reaction
- Reduction of Fehling’s solution
- Formation of an addition compound with sodium hydrogen sulfite
- Formation of crystals with 2,4-dinitrophenyl hydrazine
Question’s Answer: Reduction of Fehling’s solution
Which is the strongest reducing agent?
- C3H7OH
- CH3COCH3
- HCHO
- Câ‚‚H5OH
Question’s Answer: HCHO
What will happened, hen aldehyde reacts with Tollen’s reagent?
- A ketone is formed
- An alcohol is formed
- Ag– ions are reduced
- Ag+ ions are produced
Question’s Answer: Ag– ions are reduced
The red brown ppt of Fehling solution and Benedict solution tests are of ______.
- AgBr
- Cuâ‚‚O
- Cuo
- Ag
Question’s Answer: Cu₂O
Ketone on reduction produces which of the following?
- Secondary alcohol
- Primary alcohol
- Tertiary alcohol
D Acetic acid
Question’s Answer: Secondary alcohol
Which statements regarding carbonyl group is not correct?
- The aryl group in aromatic aldehydes speeds up the addition reaction across the carbonyl group
- The carbon atom of carbonyl group in the transition state formed during the addition reaction across the carbonyl group is sp3 hybridized
- The carbon atom of carbonyl group in aldehydes is sp2 hybridized
- 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
- Electrophilic carbon
- Unsaturation
- Less steric hindrance
- All of these
Question’s Answer: All of these
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