NEET Chemistry Aldehydes Ketones and Carboxylic Acids MCQs Set A

Question: The general formula of both aldehyde and ketone is

• a) C_nH_2n+2O  
• b) C_nH_2nO
• c) C_nH_2n–2O  
• d) C_nH_2n+4O

Answer: C_nH_2nO

Question:  The IUPAC name of following structure is

• a) 1-Hydroxy-4-methylpentan-3-one
• b) 2-Methyl-5-hydroxy-3-pentanone
• c) 4-Methyl-3-oxo-1-pentanol
• d) Hexanol-1-one-3

Answer: 1-Hydroxy-4-methylpentan-3-one

Question:  IUPAC name of CCl₃CHO is

• a) Chloral
• b) Trichloro acetaldehyde
• c) 1,1,1-trichloroethanal
• d) 2,2,2-trichloroethanal

Answer:  2,2,2-trichloroethanal

Question: Which of the following is mixed ketone?

• a) Pentanone
• b) Acetophenone
• c) Benzophenone
• d) Propanone

Answer: Acetophenone

Question:  In the following reaction product P is

• a) RCH₂OH 
• b) RCOOH
• c) RCHO
• d) RCH₃

Answer: RCHO

Question: Dry heating of calcium acetate gives

• a) Acetaldehyde
• b) Ethane
• c) Acetic acid
• d) Acetone

Answer: Acetone

Question:

Butanone, R is

• a) Hg⁺²  
• b) KMnO₄
• c) KClO₃  
• d) K₂Cr₂O₇

Answer: Hg⁺²  

Question:  Which of the following pathways produces 2-hexanone?

(i) 1-Hexyne is treated with 

(ii) 3-Methylhept-2-ene is treated with O₃ followed by hydrolysis.

(iii) n-butyl magnesium bromide reacts with acetaldehyde followed by hydrolysis and then oxidation with chromic acid.

(iv) Hydroboration-oxidation of 1-hexyne.

• a) (i), (ii) and (iii)
• b) (i) and (ii) only
• c) (i), (ii) and (iv)
• d) (i) and (iii) only

Answer: (i), (ii) and (iii)

Question:  An alkene of molecular formula C₉H₁₈ on ozonolysis gives 2,2-dimethylpropanal and butan-2-one, then the alkene is

• a) 2,2,4-trimethylhex-3-ene
• b) 2,2,6-trimethylhex-3-ene
• c) 2,3,4-trimethylhex-2-ene
• d) 2,2,4-trimethylhex-2-ene

Answer:  2,2,4-trimethylhex-3-ene

Question:

'X' can be

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question:   Select the reagent for the following reaction.

• a) SeO₂ 
• b) O₃, Zn/H₂O
• c) O₃, H₂O₂—CH₃COOH
• d) PCC

Answer:  O₃, Zn/H₂O

Question:   Acetyl chloride is reduced with LiAlH₄, the product formed is

• a) Methyl alcohol
• b) Ethyl alcohol
• c) Acetaldehyde
• d) Acetone

Answer: Ethyl alcohol

Question: Which factors will increase the reactivity of

group?

(i) Presence of a group with positive inductive effect

(ii) Presence of a group with (–ve) inductive effect

(iii) Presence of large alkyl group

• a) Only (i)
• b) Only (ii)
• c) Both (i) & (iii)
• d) Both (ii) & (iii)

Answer: Only (ii)

Question:    The increasing order of the rate of HCN addition to compounds A–D is

(A) HCHO        (B) CH₃COCH₃

(C) PhCOCH₃    (D) PhCOPh

• a) A < B < C < D
• b) D < B < C < A
• c) D < C < B < A
• d) C < D < B < A

Answer: D < C < B < A

Question:  The correct order of reactivity of PhMgBr towards given compounds

• a) (i) > (ii) > (iii)
• b) (iii) > (ii) > (i)
• c) (ii) > (iii) > (i)
• d) (i) > (iii) > (ii)

Answer: (ii) > (iii) > (i)

Question:  Predict the product

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question:

• a) Electrophilic substitution
• b) Nucleophilic addition
• c) Nucleophilic substitution
• d) Electrophilic addition

Answer: Nucleophilic addition

Question: Reaction of aldehyde with HCN followed by hydrolysis gives a compound which shows

• a) Optical isomerism
• b) Geometrical isomerism
• c) Metamerism
• d) Tautomerism

Answer: Optical isomerism

Question:  Correct order of reactivity of CH₃CHO, C₂H₅COCH₃ and CH₃COCH₃ with HCN

• a) CH₃CHO > CH₃COCH₃> CH₃COC₂H
• b) C₂H₅COCH₃> CH₃COCH₃> CH₃CHO
• c) CH₃COCH₃> CH₃CHO > C₂H₅COCH₃
• d) CH₃COCH₃> C₂H₅COCH₃> CH₃CHO

Answer:  CH₃CHO > CH₃COCH₃> CH₃COC₂H

Question:

In the above sequence of reactions A and B are

• a) (CH₃)₂C(OH)CN, (CH₃)₂C(OH)COOH 
• b) (CH₃)₂C(OH)CNH₂, (CH₃)₂C(OH)₂
• c) (CH₃)₂C(OH)CN, (CH₃)₂CHCOOH 
• d) (CH₃)₂C(OH)CNH₂, (CH₃)₂C == O

Answer: (CH₃)₂C(OH)CN, (CH₃)₂C(OH)COOH 

Question: Aldol condensation will not be observed in

• a) Chloral
• b) Phenyl acetaldehyde
• c) Hexanal
• d) Ethanal

Answer: Chloral

Question: Which of the following gives aldol condensation reaction?

• a) C₆H₅OH
• b)

  

• c)

  

• d)

  

Answer:

Question:  The diketone

on intramolecular aldol condensation gives the final product

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question: What will be the product, when carboxy phenol, obtained by Reimer-Tiemann's process, is deoxidised with Zn powder?

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question:   When m-chlorobenzaldehyde is treated with 50% Ba(OH)₂ solution, the product(s) obtained is(are)

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question: Benzyl alcohol and sodium benzoate is obtained by the action of concentrated sodium hydroxide on benzaldehyde. This reaction is known as

• a) Perkin reaction
• b) Cannizzaro reaction
• c) Sandmeyer reaction
• d) Claisen condensation

Answer: Cannizzaro reaction

Question:

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question: Which of the following compound will exhibits positive Fehling test as well as iodoform test?

• a) Methanal
• b) Ethanol
• c) Propanone
• d) Ethanal

Answer: Ethanal

Question: Dimethyl ketones are usually characterised through

• a) Tollens reagent
• b) Iodoform test
• c) Schiff's test
• d) Benedict's reagent

Answer: Iodoform test

Question:  Trichloroacetaldehyde, CCl₃CHO reacts with chlorobenzene in presence of sulphuric acid and produces

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question:   An aromatic compound 'X' with molecular formula C₉H₁₀O gives the following chemical tests

(i) Forms 2,4-DNP derivative

(ii) Reduce Tollens reagent

(iii) Undergoes Cannizzaro reaction and

(iv) On vigorous oxidation, 1,2-benzenedicarboxylic acid is obtained

The compound

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question:

Identify 'X'

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question: The IUPAC name of phthalic acid

• a) Benzene-1,2-dicarboxylic acid
• b) Benzene-1,4-dioic acid
• c) Cyclo-1,3,5-trien-1,2-dioic acid
• d) Benzene-1,3-dicarboxylic acid

Answer: Benzene-1,2-dicarboxylic acid

Question: Which of the following is optically active?

• a) Ethylene glycol
• b) Oxalic acid
• c) Glycerol
• d) Tartaric acid

Answer: Tartaric acid

Question: Saponification of ethyl benzoate with caustic soda as alkali gives

• a) Benzyl alcohol and ethanoic acid
• b) Sodium benzoate and ethanol
• c) Benzoic acid and sodium ethoxide
• d) Phenol and ethanoic acid

Answer: Sodium benzoate and ethanol

Question: The major product obtained on reaction of phenol with sodium hydroxide and carbon dioxide is

• a) Benzoic acid
• b) Salicylaldehyde
• c) Salicylic acid
• d) Phthalic acid

Answer: Salicylic acid

Question: Which of the following does not give benzoic acid on hydrolysis?

• a) Phenyl cyanide
• b) Benzoyl chloride
• c) Benzyl chloride
• d) Methyl benzoate

Answer: Benzyl chloride

Question: Acetic acid is obtained when

• 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

Answer: Acetaldehyde is oxidised with potassium dichromate and sulphuric acid

Question: Which of the following aromatic acids is most acidic?

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question:

Identify X

• a) CH₃COCH₃
• b) CH₃CHO
• c) (CH₃CO)₂O 
• d) CH₄

Answer:  (CH₃CO)₂O 

Question:  A liquid was mixed with ethanol and a drop of concentrated H₂SO₄ was added. A compound with a fruity smell was formed. The liquid was

• a) CH₃OH 
• b) HCHO
• c) CH₃COCH₃
• d) CH₃COOH

Answer:  CH₃COOH

Question: Which one of the following orders of acid strength is correct?

• a) RCOOH > HC ≡ CH > HOH > ROH
• b) RCOOH > ROH > HOH > HC ≡ CH
• c) RCOOH > HOH > ROH > HC ≡ CH
• d) RCOOH > HOH > HC ≡ CH > ROH

Answer:  RCOOH > HOH > ROH > HC ≡ CH

Question: Which of the following acids has the smallest value of dissociation constant?

• a) CH₃CHFCOOH 
• b) FCH₂CH₂COOH
• c) BrCH₂CH₂COOH   
• d) CH₃CHBrCOOH

Answer: BrCH₂CH₂COOH   

Question: The correct order of acidic strength of the carboxylic acid is

• a) Formic acid < Benzoic acid < Acetic acid
• b) Formic acid < Acetic acid < Benzoic acid
• c) Acetic acid < Formic acid < Benzoic acid
• d) Acetic acid < Benzoic acid < Formic acid

Answer: Acetic acid < Benzoic acid < Formic acid

Question:  Treatment of benzoic acid with Cl₂/FeCl₃ will give

• a) p-chlorobenzoic acid
• b) o-chlorobenzoic acid
• c) 2-4-dichlorobenzoic acid 
• d) m-chlorobenzoic acid

Answer:  m-chlorobenzoic acid

Question: Which of the following presents the correct order of the acidity in the given compounds?

• a) CH₃COOH > BrCH₂COOH > ClCH₂COOH > FCH₃COOH
• b) FCH₂COOH > CH₃COOH > BrCH₂COOH > ClCH₂COOH
• c) BrCH₂COOH > ClCH₂COOH > FCH₂COOH > CH₃COOH
• d) FCH₂COOH > ClCH₂COOH > BrCH₂COOH > CH₃COOH

Answer:  FCH₂COOH > ClCH₂COOH > BrCH₂COOH > CH₃COOH

Question:  The reaction,

is called

• a) Hell-Volhard-Zelinsky reaction
• b) Birch reaction
• c) Rosenmund reaction
• d) Hunsdiecker reaction

Answer: Hell-Volhard-Zelinsky reaction

Question:

Identify 'A'

• a) Benzene
• b) Phthalimide
• c) Benzamide
• d) Acetaldehyde

Answer: Phthalimide

Question: Identify the wrong statement from the following.

• a) Salicylic acid is 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

Answer: Methyl salicylate does not occur in natural oils

Question:

C and D are respectively

• a) Adipic acid, δ-lectone
• b) Cyclobutane, γ-lectone
• c) Cyclobutanone, δ-lectone 
• d) Adipic acid, γ-lectone

Answer:  Cyclobutanone, δ-lectone 

Question:  In the reaction

If one equivalent of each is taken, the major product will be

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question:

Product of the reaction is

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question:   The number of total final products formed in given reaction

• a) 1
• b) 2
• c) 3
• d) 4

Answer: 2

Question: Iodoform reaction is given by

• a)

  

• b)

  

• c) CH₃– CH₂– CHO 
• d) All of these

Answer:

Question: In esterification

• a) OH^– of acid is replaced by C₆H₅OH
• b) H⁺ of acid is replaced by sodium metal
• c) OH^– of alcohol is replaced by chlorine
• d) OH^– of acid is replaced by RO^– group

Answer:  OH^– of acid is replaced by RO^– group

Question: Which of the following statement is incorrect about the reaction of ammonia derivatives with carbonyl compounds?

• a) pH of solution is maintained between 3 to 4
• b) Addition of ammonia derivatives occurs followed by elimination of H₂O
• c) At very low pH (less than 3) ammonia derivatives are protonated and do not act as nucleophile
• d) At very high pH reaction becomes explosive

Answer: At very high pH reaction becomes explosive

Question: Clemmensen reduction of a ketone is carried out in the presence of which of the following?

• a) H₂ and Pt as catalyst 
• b) Glycol with KOH
• c) Zn-Hg with HCl
• d) LiAlH₄

Answer:  Zn-Hg with HCl

Question: Acetic acid exist in dimer state in benzene due to

• a) Condensation reaction
• b) Hydrogen bonding
• c) Presence of carbonyl group
• d) Strong polar nature

Answer: Hydrogen bonding

Question: Aromatic aldehydes undergoes condensation on heating with an ethanolic solution of KCN. This reaction is called as

• a) Perkin reaction
• b) Benzoin condensation
• c) Claisen condensation
• d) Cannizzaro’s reaction

Answer: Benzoin condensation

Question: The reactivity of carbonyl compounds towards nucleophilic addition reaction gets affected by

• a) Magnitude of positive charge on carbonyl carbon atom
• b) Steric hindrance
• c) Presence of electron withdrawing groups surrounding carbonyl group
• d) All of these

Answer: All of these

Question:  Following compounds are given

Which of the above compound(s), on being warmed with iodine solution and NaOH, will give iodoform?

• a) a, c & d
• b) Only b
• c) a, b & c
• d) a & b

Answer: a, b & c

Question:  A strong base can abstract an α-hydrogen from

• a) Alkane
• b) Alkene
• c) Ether
• d) Ketone

Answer: Ketone

Question: Iodoform test is not given by

• a) Ethanal
• b) Ethanol
• c) 2-pentanone
• d) 3-pentanone

Answer: 3-pentanone

Question: Which one of the following can be oxidized to the corresponding carbonyl compound?

• a) 2-hydroxy-propane 
• b) Ortho-nitro-phenol
• c) Phenol
• d) 2-methyl-2-hydroxy-propane

Answer:  2-methyl-2-hydroxy-propane

Question: Which of the following reactions will not result in the formation of carbon-carbon bonds?

• a) Friedel-Craft’s acylation
• b) Reimer-Tiemann reaction
• c) Cannizzaro reaction
• d) Wurtz reaction

Answer: Cannizzaro reaction

Question:  In a set of reactions acetic acid yielded a product D.

The structure of D would be

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question:  In the following sequence of reactions

the end product (C) is

• a) Acetaldehyde
• b) Ethyl alcohol
• c) Acetone
• d) Methane

Answer: Ethyl alcohol

Question:  An organic compound 'A' on treatment with NH₃ gives 'B' which on heating gives 'C' when treated with Br₂ in presence of KOH produces ethylamine. Compound 'A' is

• a)

  

• b) CH₃CH₂COOH 
• c) CH₃COOH 
• d) CH₃CH₂CH₂COOH

Answer:  CH₃CH₂COOH 

Question: The correct order of decreasing acid strength of trichloroacetic acid (A), trifluoroacetic acid (B), acetic acid (C) and formic acid (D) is

• a) A > B > C > D
• b) A > C > B > D
• c) B > A > D > C
• d) B > D > C > A

Answer: B > A > D > C

Question: Which one of the following products is formed when adipic acid is heated?

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question: Which of the following compound gives benzoic acid on hydrolysis?

• a) Chlorobenzene
• b) Benzoyl chloride
• c) Chlorophenol
• d) Chlorotoluene

Answer: Benzoyl chloride

Question: Aspirin is an acetylation product of

• a) m-Hydroxybenzoic acid
• b) o-Dihydroxybenzene
• c) o-Hydroxybenzoic acid
• d) p-Dihydroxybenzene

Answer: o-Hydroxybenzoic acid

Question:  Which one of the following compounds will react with NaHCO₃ solution to give sodium salt and carbon dioxide?

• a) Acetic acid
• b) n-hexanol
• c) Phenol
• d) Both (2) & (3)

Answer: Acetic acid

Question:  In a set of the given reactions, acetic acid yielded a product C

Product C would be

• a) CH₃CH(OH)C₂H₅  
• b) CH₃COC₆H₅
• c) CH₃CH(OH)C₆H₅   
• d)

  

Answer:

Question: Ethyl benzoate can be prepared from benzoic acid by using

• a) Ethyl alcohol
• b) Ethyl alcohol and dry HCl
• c) Ethyl chloride
• d) Sodium ethoxide

Answer: Ethyl alcohol and dry HCl

Question:  The OH group of an alcohol or carboxylic acid can be replaced by –Cl using

• a) Phosphorus pentachloride
• b) Hypochlorous acid
• c) Chlorine
• d) Hydrochloric acid

Answer: Phosphorus pentachloride

Question:  Propionic acid with Br₂/ P yields a dibromo product. Its structure would be

• a)

  

• b) CH₂Br—CHBr—COOH
• c)

  

• d) CH₂Br—CH₂—COBr

Answer:

Question:  In a set of reactions, ethyl benzene yielded a product D.

‘D’ would be

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question:  What is Z in following sequence of reactions?

• a) Benzene
• b) Toluene
• c) Benzaldehyde
• d) Benzoic acid

Answer: Benzoic acid

Question:

The product Y is

• a) Lactic acid
• b) n-propyl amine
• c) Ethylamine
• d) Alanine

Answer: Alanine

Question:

Major product.

Product of the reaction is

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question:   Which of the following is the correct sequence of decreasing reactivity towards hydroxide ion promoted hydrolysis among the following compounds?

• a) I > II > III > IV
• b) II > I > IV > III
• c) III > II > IV > I
• d) I > III > II > IV

Answer: I > III > II > IV

Question:

Y and X respectively are

• a) CH₃CH₂COOH, CH₃CH₂CN  
• b) CH₃CH₂CN, CH₂CH₂COOH
• c) CH₃CH₂CH₂COOH, CH₃CH₂CH₃    
• d) CH₃CH₃, CH_`CH₂COOCH₃

Answer:  CH₃CH₂CN, CH₂CH₂COOH

Question:  The product D of the reaction

• a) HCONH₂
• b) CH₃CN  
• c) CH₃CH₂NH₂
• d) CH₃CONH₂

Answer:  CH₃CONH₂

Question: The relative reactivities of acyl compounds towards nucleophilic substitution are in the order of

• a) Acyl chloride > Ester > Acid anhydride > Amide
• b) Acyl chloride > Acid anhydride > Ester > Amide
• c) Ester > Acyl chloride > Amide > Acid anhydride
• d) Acid anhydride > Amide > Ester > Acyl chloride

Answer: Acyl chloride > Ester > Acid anhydride > Amide

Question: Reaction of a carbonyl compound with one of the following reagents involves nucleophilic addition followed by elimination of water. The reagent is

• a) Hydrocyanic acid
• b) Sodium hydrogen sulphite
• c) A Grignard reagent
• d) Hydrazine in presence of feebly acidic solution

Answer: Hydrazine in presence of feebly acidic solution

Question: Which one of the following esters gets hydrolysed most easily under alkaline conditions?

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question:  The oxidation of benzene by V₂O₅ in the presence of air produces 

• a) Benzoic acid
• b) Benzaldehyde
• c) Benzoic anhydride
• d) Maleic anhydride

Answer: Maleic anhydride

Question:  Treatment of cyclopentanone

with methyl lithium gives which of the following species?

• a) Cyclopentanonyl biradical
• b) Cyclopentanonyl anion
• c) Cyclopentanonyl cation
• d) Cyclopentanonyl radical

Answer: Cyclopentanonyl anion

Question:  An organic compound "X" having molecular formula C₅H₁₀ O yields phenyl hydrazone and gives negative response to the Iodoform test and Tollen's test. It produces n-pentane on reduction. 'X' could be : 

• a) n-amyl alcohol
• b) Pentanal
• c) 2-pentanone 
• d) 3-pentanone

Answer:  3-pentanone