Aldehydes & Ketones PYQs Set 1 (PDF)

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Mere Teacher · Previous Year Questions NEET Chemistry · Aldehydes & Ketones · Set 1 (Q1-30)
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1. $Match List - I with List - II. (Test) (A) Bayer’s test MARKS (B) Ceric ammonium nitrate test (C) Phthalein dye test R K (D) Schiff’s test (Identification) (I) Phenol VIARKS (II) Aldehyde (III) Alcoholic-OH group (IV) Unsaturation Choose the correct answer from the options given below :$ (1) $(A)-(IV), (B)-(III), (C)-(I), (D)-(II)$ (2) $(A)-(II), (B)-(III), (C)-(IV), (D)-(I)$ (3) $(A)-(IV), (B)-(I), (C)-(II), (D)-(III)$ (4) $(A)-(III), (B)-(I), (C)-(IV), (D)-(II)$ 2. $C H_{3} C H O and C_{6} H_{5} C H_{2} C H O can be distinguished chemically by$ (1) $Benedict’s test$ (2) $iodoform test$ (3) $Tollens’ reagent test$ (4) $Fehling’s solution test.$ 3. $The major product of the following reaction is : CH_{3} C H_{2} CH = C H_{2} \frac{H _{2}}{CO} Rh catalyst$ (1) $C H_{3} C H_{2} C H_{2} CHO$ (2) $C H_{3} C H_{2} CH = CH - CHO$ (3) $C H_{3} C H_{2} C H_{2} C H_{2} CHO$ (4) $C H_{3} C H_{2} C = C H_{2} \| CHO$ 4. $The correct order of reactivity of aldehydes and ketones towards hydrogen cyanide is$ (1) $CH_{3} COCH_{3} > CH_{3} CHO > HCHO$ (2) $CH_{3} COCH_{3} > HCHO > CH_{3} CHO$ (3) $CH_{3} CHO > CH_{3} COCH_{3} > HCHO$ (4) $HCHO > CH_{3} CHO > CH_{3} COCH_{3}$ 5. $Given below are two statements: Statement-I : CeO_{2} can be used for oxidation of aldehydes and ketones. Statement-II : Aqueous solution of EuSO_{4} is a strong reducing agent.$ (1) $Statement I is true, statement II is false$ (2) $Statement I is false, statement II is true$ (3) $Both Statement I and Statement II are false$ (4) $Both Statement I and Statement II are true.$ 6. $In the reaction, C_{6} H_{5} COCH_{3} \to [H] Zn - Hg / conc . HCl X, X is$ (1) $toluene$ (2) $methylbenzene$ (3) $benzylalcohol$ (4) $ethylbenzene.$ 7. $Which of the following statements are TRUE about Haloform reaction?:(A) Sodium hypochlorite reacts with KI to give KOI .(B) KOI is a reducing agent.(C) α, β -unsaturated methylketone (CH_{3} - CH = CH - O O - CH_{3}) will give iodoform reaction.(D) Isopropyl alcohol will not give iodoform test.(E) Methanoic acid will give positive iodoform test. Choose the correct answer from the options given below:$ (1) $(A), (C) & (E) Only$ (2) $(B), (D) & (E) Only$ (3) $(A) & (C) Only$ (4) $(A), (B) & (C) Only$ 8. $Which of the following compounds would give the following set of qualitative analysis ? (i) Fehling's Test: Positive (ii) Na fusion extract upon treatment with sodium nitroprussidc gives a blood red colour but not$ (1) (2) (3) (4) 9. $Among the given compounds, the most susceptible to nucleophilic attack at the carbonyl group is$ (1) $C H_{3} C O O C H_{3}$ (2) $C H_{3} C O N H_{2}$ (3) $C H_{3} C O O C O C H_{3}$ (4) $C H_{3} C O C l$ 10. $Iodoform test can differentiate between(A) Methanol and Ethanol(B) CH_{3} COOH and CH_{3} CH_{2} COOH (C) Cyclohexene and cyclohexanone(D) Diethyl ether and Pentan-3-one(E) Anisole and acetone Choose the correct answer from the options given below:$ (1) $(B), (C) & (E) Only$ (2) $(A) & (D) Only$ (3) $(A) & (E) Only$ (4) $(A), (B) & (E) Only$ 11. $A strong base can abstract an α ‐hydrogen from$ (1) $ketone$ (2) $alkane$ (3) $alkene$ (4) $amine$ 12. $Alkenes (X) and carbonyl compounds (Y) participate in which of the following addition reactions? (X) (Y)$ (1) $Electrophilic Electrophilic$ (2) $Nucleophilic Electrophilic$ (3) $Electrophilic Nucleophilic$ (4) $Nucleophilic Nucleophilic$ 13. $The major product of the following reaction is: R - C \equiv N \frac{( i ) AlH ( i - Bu ) _{2}}{( ii ) H _{2} O}$ (1) $RCOOH$ (2) $RCON H_{2}$ (3) $RCHO$ (4) $RC H_{2} N H_{2}$ 14. $Match List I with List II List - I (Test) A. Br_{2} water test B. Ceric ammonium nitrate test C. Ferric chloride test D. 2,4 - DNP test List - II (Observation) I. Yellow orange or orange red precipitate formed II. Reddish orange colour disappears III. Red colour appears IV. Blue, Green, Violet or Red colour appear Choose the correct answer from the options given below:$ (1) $A-III, B-IV, C-I, D-II$ (2) $A-I, B-II, C-III, D-IV$ (3) $A-IV, B-I, C-II, D-III$ (4) $A-II, B-III, C-IV, D-I$ 15. $Aldol condensation will not take place in$ (1) $C H_{3} C O C H_{3}$ (2) $C H_{3} C H O$ (3) $H C H O$ (4) $C H_{3} C H_{2} C H O$ 16. $List-I Reaction (A) Hoffmann Degradation (B) Clemenson reduction (C) Cannizaro reaction (D) Reimer-Tiemann reaction List-II Reagents (I) Conc.KOH, Δ (II) C H C 1_{3}, NaOH/ H_{3} O^{+} (III) B r_{2}, NaOH (IV) Zn-Hg/HCl$ (1) $(A)-III, (B)-IV,(C)-II,(D)-I$ (2) $(A) - II, (B) - IV, (C) -I, (D) - III$ (3) $(A)-III, (B)-IV,(C)-I,(D)-II$ (4) $(A) - II, (B) -I, (C) - III, (D) - IV$ 17. $What are the products formed when an aldehyde (R CHO) is reacted with Tollen's reagent?$ (1) $Ag, H_{2} O, R CH_{2} OH, NH_{3}$ (2) $Ag, H_{2} O, R COO^{-}, H_{2}$ (3) $Ag, H_{2} O, R COO^{-}, NH_{3}$ (4) $Ag_{2}, H_{2} O, R COO^{-}, NH_{3}$ 18. $Match the following: Column-I (Reaction of carbonyl compound with) A. Hydroxylamine B. Alcohol C. Hydrazine D. Amine Column-II (Product) 1. Hydrazone 2. Schiff’s base (Substituted imine) 3. Oxime 4. Ketal The correct match is Codes: A B C D$ (1) $3412$ (2) $3214$ (3) $1432$ (4) $1234$ 19. $' x' is the product which is obtained from propanenitrile and stannous chloride in the presence of hydrochloric acid followed by hydrolysis. ' y' is the product which is obtained from the but-2-ene by the ozonolysis followed by hydrolysis. From the following, which product is not obtained when one mole of ' x' and one mole of ' y' react with each other in the presence of alkali followed by heating?$ (1) $2-Methylpent-2-enal$ (2) $Pent-2-enal$ (3) $2-Methylbut-2-enal$ (4) $3-Methylbut-2-enal$ 20. $The order of reactivity of carbonyl compounds for nucleophilic addition is$ (1) $A r_{2} C = O > R_{2} C = O > A r C H O > R C H O > H_{2} C = O$ (2) $H_{2} C = O > R_{2} C = O > A r_{2} C = O > R C H O > A r C H O$ (3) $H_{2} C = O > R C H O > A r C H O > R_{2} C = O > A r_{2} C = O$ (4) $A ι C H O > A r_{2} C = O > R C H O > R_{2} C = O > H_{2} C = O$ 21. $Both acetaldehyde and acetone (individually) undergo which of the following reactions? A. Iodoform Reaction B. Cannizaro Reaction C. Aldol Condensation D. Tollen's Test E. Clemmensen Reduction Choose the correct answer from the options given below:$ (1) $A, B and D Only$ (2) $C and E Only$ (3) $A, C and E Only$ (4) $B, C and D Only$ 22. $The product formed in aldol condensation is$ (1) $a beta‐hydroxy aldehyde or a beta‐ hydroxy ketone$ (2) $an alpha‐hydroxy aldehyde or ketone$ (3) $an alpha, beta unsaturated ester$ (4) $a beta‐hydroxy acid.$ 23. $Given below are two statements: Statement I: Cross aldol condensation between two different aldehydes will always produce four different products. Statement II: When semicarbazide reacts with a mixture of benzaldehyde and acetophenone under optimum pH , it forms a condensation product with acetophenone only. In the light of the above statements, choose the correct answer from the options given below$ (1) $Statement I is false but Statement II is true$ (2) $Both Statement I and Statement II are false$ (3) $Both Statement I and Statement II are true$ (4) $Statement I is true but Statement II is false$ 24. $Number of molecules from below which cannot give iodoform reaction is: Ethanol, Isopropyl alcohol, Bromoacetone, 2Butanol, 2-Butanone, Butanal, 2-Pentanone, 3Pentanone, Pentanal and 3-Pentanol.$ (1) $4$ (2) $3$ (3) $5$ (4) $2$ 25. $On electrolysis of aqueous solution of sodium butanoate gives a hydrocarbon. The number of carbon atoms present in hydrocarbon are$ (1) $6$ (2) $4$ (3) $8$ (4) $3$ 26. $Which of the following compounds will undergo self aldol condensation in the presence of cold dilute alkali?$ (1) $C H \equiv C - C H O$ (2) $C H_{2} = CHCHO$ (3) $C_{6} H_{5} C H O$ (4) $C H_{3} C H_{2} C H O$ 27. $The correct order of pK_{a} of the following is (I) CCl_{3} COOH (II) CF_{3} COOH (III) NO_{2} CH_{2} COOH (IV) NCCH_{2} COOH$ (1) $(I) < (II) < (III) < (IV)$ (2) $(III) < (II) < (I) < (IV)$ (3) $(II) < (I) < (III) < (IV)$ (4) $(II) < (III) < (I) < (IV)$ 28. $Predict the products in the given reaction.$ (1) (2) (3) (4) 29. $The increasing order of the following compounds towards HCN addition is$ (1) $(iii) < (iv) < (ii) < (i)$ (2) $(iii) < (i) < (iv) < (ii)$ (3) $(iii) < (iv) < (i) < (ii)$ (4) $(i) < (iii) < (iv) < (ii)$ 30. $The product (P) formed in the following reaction is:$ (1) (2) (3) (4)