JEE Chemistry Aldehydes Ketones and Carboxylic Acids MCQs Set A

Question. The IUPAC name of the compound having the molecular formula Cl₃C –CH₂CHO is
(a) 3, 3, 3- trichloropropanal
(b) 1, 1, 1- trichloropropanal
(c) 2, 2, 2- trichloropropanal
(d) Chloral

Answer: A

Question. The IUPAC name of CH₃COCH(CH₃)₂ is
(a) 3-methyl-2-butanone
(b) 2-methyl-3-butanone
(c) 4-methylisopropyl ketone
(d) Isopropylmethyl ketone

Answer: A

Question. IUPAC name of ethyl isopropyl ketone is
(a) 2-methyl pent-3-one
(b) 2-methyl pent-2-one
(c) 4-methyl pent-3-one
(d) 4-methyl pent-2-one

Answer: A

Question. In > C = O group sigma bond is formed by
(a) sp²-p-overlapping
(b) sp³-p-overlapping
(c) s-p-overlapping
(d) sp-p-overlapping

Answer: A

Question. Which of the following contain an aldehyde?
(a) All of these
(b) Meadow sweet
(c) Vanilla beans
(d) Cinnamon

Answer: A

Question. Which of the following have pleasant smell?
(a) Hexanal
(b) Propanal
(c) Methanal
(d) Ethanal

Answer: A

Question. Which one of the following can be oxidised to the corresponding carbonyl compound?
(a) 2-hydroxy-propane
(b) Ortho-nitrophenol
(c) Phenol
(d) 2-methyl-2 hydroxy-propane

Answer: A

Question. Which one of the following on oxidation gives a ketone ?
(a) Secondary alcohol
(b) All of these
(c) Primary alcohol
(d) Tertiary alcohol

Answer: A

Question. What is formed when a primary alcohol undergoes catalytic dehydrogenation
(a) Aldehyde
(b) Alkene
(c) Ketone
(d) Acid

Answer: A

Question. Primary and secondary alcohols on action of reduced copper give
(a) Aldehydes and ketones respectively
(b) Ketones and aldehydes respectively
(c) Only aldehydes
(d) Only ketones

Answer: A

Question. The catalyst used in Rosenmund's reduction is
(a) Pd/BaSO₄
(b) HgSO₄
(c) anhydrous ZnCl₂
(d) None of these

Answer: A

Question. The oxidation of toluene to benzaldehyde by chromyl chloride is called
(a) Etard reaction
(b) Rosenmund reaction
(c) Wurtz reaction
(d) Fittig reaction

Answer: A

Question. An aldehyde group can be present
(a) only at the end of carbon chain
(b) at the second carbon atom of the carbon chain
(c) at any position in carbon atom
(d) in between carbon chain

Answer: A

Question. Which of the following is not used in the preparation of ketone?
(a) Acid hydrolysis of alkyl cyanide
(b) Pyrolysis of calcium acetate
(c) Dehydrogenation of 2° alcohol
(d) Oxidation of secondary alcohols

Answer: A

Question. Which aldehyde cannot be obtained by Rosenmund’s reaction?
(a) HCHO
(b) CH₃CHO
(c) CH₃CH₂CHO
(d) All of these

Answer: A

Question. Which of the following is used to prepare ketone from acyl chloride ?
(a) R₂Cd
(b) CrO₃
(c) R-MgX
(d) CO + HCl

Answer: A

Question. Which of the following forces explain the boiling point of aldehydes and ketones?
(a) Dipole-dipole attraction
(b) Hydrogen bonding
(c) van der Waal’s forces
(d) None of these

Answer: A

Question. Which is highly soluble in water?
(a) Methanal
(b) Propanone
(c) Propanal
(d) Butanone

Answer: A

Question. Propanal and propanone, both have same molecular formula(C₃H₆O), what do you expect about their boiling points?
(a) Boiling point of propanal is lower than the boiling point of propanone
(b) Boiling point of propanal is higher than the boiling point of propanone
(c) None of these
(d) Nothing can be predicted

Answer: A

Question. Less reactivity of ketone is due to
(a) Both
(b) + I inductive effect decrease positive charge on carbonyl carbon atom
(c) steric effect of two bulky alkyl groups
(d) None of these

Answer: A

Question. Acetaldehyde reacts with
(a) Nucleophiles only
(b) Free radicals only
(c) Both electrophiles and nucleophiles
(d) Electrophiles only

Answer: A

Question. Carbonyl compounds undergo nucleophilic addition because of
(a) more stable anion with negative charge on oxygen atom and less stable carbonium ion
(b) electromeric effect
(c) electronegativity difference of carbon and oxygen atoms
(d) None of the above

Answer: A

Question. Which of the following statement is false ?
(a) None of the above
(b) Aldol condensation is given by aldehydes and ketones in presence of acids
(c) Aldol condensation is given by aldehydes in presence of alkali
(d) Cannizzaro reaction is given by aldehydes in presence of alkali

Answer: A

Question. If formaldehyde and KOH are heated, then we get
(a) methyl alcohol
(b) acetylene
(c) methane
(d) ethyl formate

Answer: A

Question. The reagent which can be used to distinguish acetophenone from benzophenone is
(a) I₂ and Na₂CO₃
(b) benedict reagent
(c) aqueous solution of NaHSO₃
(d) 2,4- dinitrophenylhydrazine

Answer: A

Question. Acetone reacts with iodine (I₂) to form iodoform in the presence of
(a) NaOH
(b) MgCO₃
(c) CaCO₃
(d) KOH

Answer: A

Question. (CH₃)₃C–CHO does not undergo aldol condensation due to
(a) absence of alpha hydrogen atom in the molecule
(b) cleavage taking place between —C— CHO bond
(c) three electron donating methyl groups
(d) bulky (CH₃)₃C—group

Answer: A

Question. Acetaldehyde reacts with semicarbazide and forms semicarbazone. Its structure is
(a) CH₃CH = NNHCONH₂
(b) CH₃CH = NNHCON = CHCH₃
(c) CH₃CH = N—CONHNH₂
(d) None of these

Answer: A

Question.  Iodoform test is not given by
(a) 3-Pentanone
(b) Ethanol
(c) 2-Pentanone
(d) Ethanal

Answer: A

Question. Phenylmethyl ketone can be converted into ethylbenzene in one step by which of the following reagents?
(a) Zn-Hg/HCl
(b) CH₃MgI
(c) LiAlH₄
(d) NaBH₄

Answer: A

Question. When acetaldehyde is heated with Fehling’s solution it gives a precipitate of
(a) Cu₂O
(b) Cu
(c) CuO
(d) Cu(OH)₂

Answer: A

Question. Aldol condensation would not occur in
(a) HCHO
(b) CH₃COCH₃
(c) CH₃CH₂CHO
(d) CH₃CHO

Answer: A

Question. Which of the following compound will show positive silver mirror test ?
(a) Both
(b) HCOOH
(c) CH₃ (CHOH)₃CHO
(d) None of these

Answer: A

Question. Aldehydes and ketones are distinguished by which of the following test ?
(a) Tollen’s test
(b) Lucas test
(c) KMnO₄ solution (Baeyer’s test)
(d) None of these

Answer: A

Question. Aldehydes and ketones are generally reduced by
(a) Clemmensen reduction
(b) H₂S
(c) H₂ / Ni
(d) None of these

Answer: A

Question. In which reaction, > C = O can be reduced to > CH₂?
(a) Wolf-Kishner reaction
(b) Reimer-Tiemann reaction
(c) Wurtz reaction
(d) None of these

Answer: A

Question.  A compound does not react with 2, 4-dinitrophenylhydrazine, the compound is
(a) CH₃OH
(b) Acetone
(c) Acetaldehdye
(d) None of these

Answer: A

Question. Which gives lactic acid on hydrolysis after reacting with HCN ?
(a) CH₃CHO
(b) HCHO
(c) C₆H₅CHO
(d) CH₃COCH₃

Answer: A

Question. The most appropriate reagent to distinguish between acetaldehyde and formaldehyde is
(a) Iodine in presence of base
(b) Schiff’s reagent
(c) Tollen’s reagent
(d) Fehling’s solution

Answer: A

Question. Aldehydes can be oxidised by
(a) All the above
(b) Fehling solution
(c) Tollen’s reagent
(d) Benedict solution

Answer: A

Question. 2-pentanone and 3-pentanone can be distinguished by
(a) Iodoform reaction
(b) Aldol condensation
(c) Cannizaro's reaction
(d) None of these

Answer: A

Question. Cross aldol condensation occurs between
(a) two different aldehydes and ketones
(b) two same ketones
(c) two same aldehydes
(d) None of these

Answer: A

Question. Ketone upon treatment with Grignard Reagent gives
(a) tertiary alcohol
(b) primary alcohol
(c) secondary alcohol
(d) aldehyde

Answer: A

Question. When acetaldehyde reacts with alcohol then produce
(a) Acetal
(b) Acetone
(c) Ketal
(d) None

Answer: A

Question. The product formed in Aldol condensation is
(a) a beta-hydroxy aldehyde or a beta-hydroxy ketone
(b) an alpha-hydroxy aldehyde or ketone
(c) an alpha, beta unsaturated ester
(d) a beta-hydroxy acid

Answer: A

Question. Clemmensen reduction of a ketone is carried out in the presence of which of the following ?
(a) Zn-Hg with HCl
(b) H₂ and Pt as catalyst
(c) Glycol with KOH
(d) LiAlH₄

Answer: A