NEET Chemistry Aldehydes Ketones and Carboxylic Acids MCQs Set B

Question: Which of the following will not be soluble in sodium hydrogen carbonate?

• a) 2,4,6 -trinitrophenol 
• b) Benzoic acid
• c) o-Nitrophenol
• d) Benzenesulphonic acid

Answer:  o-Nitrophenol

Question: Which one is most reactive towads Nucleophilic addition reaction?

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question: Reaction by which Benzaldehyde cannot be prepared

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

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: In the following sequence of reactions

the end product (C) is 

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

Answer: Ethyl alcohol

Question: Predict the products in the given reaction

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question: Which of the following acids does not exhibit optical isomerism ?

• a) Lactic acid
• b) Tartaric acid
• c) Maleic acid
• d) α-amino acids

Answer: Maleic acid

Question: CH₃CHO and C₆H₅CH₂CHO can be distinguished chemically by 

• a) Tollen's reagent test
• b) Fehling solution test
• c) Benedict test
• d) Iodoform test

Answer: Iodoform test

Question: Acetone is treated with excess of ethanol in the presence of hydrochloric acid. The product obtained is

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question:  Consider the following reaction

The product A is 

• a) C₆H₆CHO 
• b) C₆H₅OH
• c) C₆H₅COCH₃ 
• d) C₆H₅Cl

Answer:  C₆H₆CHO 

Question:   Consider the reaction

What sort of reaction is it? 

• a) Electrophilic addition - elimination reaction
• b) Free radical addition - elimination reaction
• c) Electrophilic substitution - elimination reaction
• d) Nucleophilic addition - elimination reaction

Answer: Nucleophilic addition - elimination reaction

Question:  In a set of reactions m-Bromobenzoic acid gave a product D. Identify the product D

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question: Which one is a nucleophilic substitution reaction among the following

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

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

• a)

  

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

Answer: CH₃COOH

Question:  Match the compounds given in Column-I with Column-II and select the suitable option using the code given below

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

Answer: a(ii), b(i), c(iv), d(iii)

Question:  The order of reactivity of Phenyl magnesium bromide (PhMgBr) with the following compounds

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

Answer: I > II > III

More Questions.........................................

Question: Given are cyclohexanol(I), acetic acid(II), 2,4,6-trinitrophenol (III) and phenol(IV). In these the order of decreasing acidic character will be [AIPMT (Prelims)-2010]

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

Answer: III > II > IV > I

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

D would be

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question: Among the given compounds, the most susceptible to nucleophilic attack at the carbonyl group is

• a) CH₃COOCH₃   
• b) CH₃CONH₂
• c) CH₃COOCOCH₃ 
• d) CH₃COCl

Answer:  CH₃COCl

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

• a) Reimer-Tieman reaction
• b) Cannizaro reaction
• c) Wurtz reaction
• d) Friedel-Crafts acylation

Answer: Cannizaro reaction

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

Answer: a, b and c

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

• a)

  

• b) CH₂Br–CH₂–COBr
• c)

  

• d) CH₂Br–CHBr–COOH

Answer:

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

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

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

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

Answer: Ketone

Question:  Acetophenone when reacted with a base, C₂H₅ ONa, yields a stable compound which has the structure ?

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

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 > Acid anhydride > Ester > Amide

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

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

Answer:  FCH₂COOH > ClCH₂COOH > BrCH₂COOH > CH₃COOH

Question: The product formed in Aldol condensation is

• a) An alpha, beta unsaturated ester
• b) A beta-hydroxy acid
• c) A beta-hydroxy aldehyde or a beta-hydroxy ketone
• d) An alpha-hydroxy aldehyde or ketone

Answer: A beta-hydroxy aldehyde or a beta-hydroxy ketone

Question: Reduction of aldehydes and ketones into hydrocarbons using zinc amalgam and conc. HCl is called

• a) Wolf-Kishner Reduction
• b) Clemmensen Reduction
• c) Cope Reduction
• d) Dow Reduction

Answer: Clemmensen Reduction

Question:  Consider the following compounds

The correct decreasing order of their reactivity towards hydrolysis is 

• a) (b) > (d) > (a) > (c)
• b) (b) > (d) > (c) > (a)
• c) (a) > (b) > (c) > (d)
• d) (d) > (b) > (a) > (c)

Answer: (b) > (d) > (a) > (c)

Question:  Which of the compounds with molecular formula C₅H₁₀ yields acetone on ozonolysis ? 

• a) 2 – Methyl – 1 – butene 
• b) 2 – Methyl – 2 – butene
• c) 3 – Methyl – 1 – butene 
• d) Cyclopentane

Answer:  2 – Methyl – 2 – butene

Question:  In a set of reactions propionic acid yielded a compound D

The structure of D would be 

• a) CH₃CH₂CH₂NH₂
• b) CH₃CH₂CONH₂ 
• c) CH₃CH₂NHCH₃  
• d) CH₃CH₂NH₂

Answer:  CH₃CH₂NH₂

Question:   A carbonyl compound reacts with hydrogen cyanide to form cyanohydrin which on hydrolysis forms a racemic mixture of α–hydroxy acid. The carbonyl compound is 

• a) Acetaldehyde
• b) Acetone
• c) Diethylketone
• d) Formaldehyde

Answer: Acetaldehyde

Question: Nucleophilic addition reaction will be most favoured in

• a)

  

• b) (CH₃)₂C = O
• c) CH₂CH₂CHO  
• d) CH₃CHO

Answer:  CH₃CHO

Question: Self condensation of two moles of ethyl acetate in presence of sodium ethoxide yields

• a) Ethyl butyrate
• b) Acetoacetic ester
• c) Methyl acetoacetate
• d) Ethyl propionate

Answer: Acetoacetic ester

Question:  Products of the following reaction

• a) CH₃CHO + CH₃CH₂CHO  
• b) CH₃COOH + CH₃COCH₃
• c) CH₃COOH + HOOC . CH₂CH₃  
• d) CH₃COOH + CO₂

Answer:  CH₃COOH + HOOC . CH₂CH₃  

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 conversion of

X is

• a) H₂/Pt  
• b) Zn-Hg/HCl  
• c) Li/NH₃
• d) NaBH₄

Answer:  NaBH₄

Question: Which of the following is not chiral ?

• a) 2-Butanol
• b) 2, 3-diBromopentane
• c) 3-Bromopentane
• d) 2-Hydroxypropanoic acid

Answer:  3-Bromopentane

Question: Which of the following compound will undergo self aldol condensation in the presence of cold dilute alkali?

• a) CH ≡ C – CHO 
• b) CH₂= CH – CHO
• c) C₆H₅CHO  
• d) CH₃CH₂CHO

Answer:  CH₃CH₂CHO

Question: In Tollen’s test, aldehydes

• a) Are oxidised to acids
• b) Are reduced to alcohol
• c) Neither reduced nor oxidised
• d) Precipitate Ag⁺ as AgCl

Answer: Are oxidised to acids

Question: Which of the following compounds will give positive test with Tollen’s reagent?

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

Answer: Acetaldehyde

Question: The order of reactivity of carbonyl compounds for nucleophilic addition is

• a) Ar₂C = O >R₂C = O > ArCHO > RCHO > H₂C = O 
• b) H₂C = O > R₂C = O > Ar₂C = O > RCHO > ArCHO
• c) H₂C = O > RCHO > ArCHO > R₂C = O > Ar₂C = O
• d) ArCHO > Ar₂C = O > RCHO > R₂C = O > H₂C = O

Answer:   H₂C = O > RCHO > ArCHO > R₂C = O > Ar₂C = O

Question:  The oxidation of toluene with CrO₃ in the presence of (CH₃CO)₂O gives a product A, which on treatment with aqueous NaOH, produces

• a) C₆H₅COONa
• b) 2, 4-diacetyl toluene
• c) C₆H₅CHO 
• d) (C₆H₅CO)₂O

Answer:  C₆H₅CHO 

Question:  When aniline reacts with oil of bitter almonds (C₆H₅CHO) condensation takes place and benzal derivative is formed. This is known as

• a) Schiff’s base
• b) Benedict’s reagent
• c) Million’s base
• d) Schiff’s reagent

Answer: Schiff’s base

Question: The oxidation of toluene to benzaldehyde by chromyl chloride is called

• a) Etard reaction
• b) Reimer-Tiemann reaction
• c) Wurtz reaction
• d) Cannizzaro’s reaction

Answer: Etard reaction

Question: Polarisation in acrolein can be described as

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question:  First product of the reaction between RCHO and NH₂NH₂

• a) RCH = NNH₂ 
• b) RCH = NH 
• c) RCH₂NH₂
• d) RCON₃

Answer: RCH = NNH₂ 

Question: Which of the following is correct?

• a) On reduction, any aldehyde gives secondary alcohol
• b) Reaction of vegetable oil with H₂SO₄ gives glycerine
• c) Ethyl alcohol and iodine with NaOH gives iodoform
• d) Sucrose on reaction with NaCl gives inverted sugar

Answer: Ethyl alcohol and iodine with NaOH gives iodoform

Question: Aldol condensation will not take place in

• a) CH₃CHO 
• b) CH₃COCH₃
• c) HCHO
• d) CH₃CH₂CHO

Answer: HCHO

Question:

Product ‘P’ in the above reaction is

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question:  In this reaction

an asymmetric centre is generated.The acid obtained would be

• a) D-isomer 
• b) L-isomer
• c) 50% d + 50% l-isomer
• d) 20% d + 80% l-isomer

Answer:  50% d + 50% l-isomer

Question:  Compound A has a molecular formula C₂Cl₃OH. It reduces Fehling’s solution and on oxidation, it gives a monocarboxylic acid B. If A is obtained by the action of chlorine on ethyl alcohol, then compound A is

• a) Methyl chloride
• b) Monochloroacetic acid
• c) Chloral
• d) Chloroform

Answer: Chloral

Question: Which one of the following on treatment with 50% aqueous sodium hydroxide yields the corresponding alcohol and acid?

• a) C₆H₅CHO  
• b) CH₃CH₂CH₂CHO
• c)

  

• d) C₆H₅CH₂CHO

Answer:  C₆H₅CHO  

Question: Dry heating of calcium acetate gives

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

Answer: Acetone

Question: Which of the following is mixed ketone?

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

Answer: Acetophenone

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: 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: Aldol condensation will not be observed in

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

Answer: Chloral