Aldehydes & Ketones PYQs Set 2 (PDF)

Set 2 of 10 · Questions 31-60 of 285

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Mere Teacher · Previous Year Questions JEE Main Chemistry · Aldehydes & Ketones · Set 2 (Q31-60)
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31. $The product (P) formed in the following reaction is:$ (1) (2) (3) (4) 32. $The increasing order of the reactivity of the following compounds in nucleophilic addition reaction is Propanal, Benzaldehyde, Propanone, Butanone$ (1) $Propanal < Propanone < Butanone < Benzaldehyde$ (2) $Benzaldehyde < Propanal < Propanone < Butanone$ (3) $Benzaldehyde < Butanone < Propanone < Propanal$ (4) $Butanone < Propanone < Benzaldehyde < Propanal$ 33. $Which one of the following is not formed when acetone reacts with 2-pentanone in the presence of dilute NaOH followed by heating? [NEET 2022]$ (1) (2) (3) (4) 34. $Which one of the following on treatment with 50% aqueous sodium hydroxide yields the corresponding alcohol and acid?$ (1) $C_{6} H_{5} C H O$ (2) $C H_{3} C H_{2} C H_{2} C H O$ (3) $C H_{3} - C (= O) - C H_{3}$ (4) $C_{6} H_{5} C H_{2} C H O$ 35. $m-chlorobenzaldehyde on treatment with 50 % KOH solution yields$ (1) $3-ClC_{6} H_{4} -CH(OH)-C(=O)-C_{6} H_{4} Cl-3$ (2) $3-ClC_{6} H_{4} COO^{-} + 3-ClC_{6} H_{4} CH_{2} OH$ (3) $3-HOC_{6} H_{4} CHO + 3-HOC_{6} H_{4} CHO$ (4) $3-HOC_{6} H_{4} COO^{-} + 3-HOC_{6} H_{4} CH_{2} OH$ 36. $Which of the following product is formed when cyclohexanone undergoes aldol condensation followed by heating? [NEET 2017]$ (1) (2) (3) (4) 37. $Polarisation in acrolein can be described as + 8 + δ$ (1) $H_{2} C + δ = C H - C H O + δ$ (2) $H_{2} C - δ = C H - C H O + δ$ (3) $H_{2} C - δ = C H - C H O + δ$ (4) $H_{2} C + δ = C H - C H O - δ$ 38. $If formaldehyde and KOH are heated, then we get$ (1) $methane$ (2) $methyl alcohol$ (3) $ethyl formate$ (4) $acetylene$ 39. $Identify the product ' B' in following reaction. Ethyl phenyl ketone H_{2} NNH_{2} A KOH, HO(CH_{2})_{2} OH Δ B$ (1) $Phenylhydrazone$ (2) $Ethyl benzene$ (3) $n -propyl benzene$ (4) $Isopropyl benzene$ 40. $An alkene X with formula C_{4} H_{8} does not exhibit geometrical isomerism. In the conversion of X to Y, the correct sequence of reagents A and B used are (Y gives iodoform test)$ (1) $B H_{3}, H_{2} O_{2} / O H^{-}, PCC$ (2) $H_{2} O / H^{+}, ZnCl_{2} / HCl$ (3) $H_{2} O / H^{+}, Cu/573 K$ (4) $B H_{3}, H_{2} O_{2} / O H^{-}, Cu/573 K$ 41. $Identify A in the given chemical reaction. NaOH C_{2} H_{5} OH, H_{2} O ∆ A (Major Product)$ (1) (2) (3) (4) 42. $Consider the reactions, Identify A, X, Y and Z . [NEET 2017]$ (1) $A -methoxymethane, X -ethanoic acid, Y -acetate ion, Z -hydrazine$ (2) $A-methoxymethane, X -ethanol, Y -ethanoic acid, Z -semicarbazide$ (3) $A -ethanal, X -ethanol, Y-but-2-enal, Z -semicarbazone$ (4) $A -ethanol, X -acetaldehyde, Y -butanone, Z -hydrazone$ 43. $The number of aldehydes that undergo cannizaro reaction from the following are Phenyl ethanal, Methanal, 2 Methoxy propanal, Trichoro ethanal$ (1) $2$ (2) $3$ (3) $4$ (4) $1$ 44. $Self condensation of two moles of ethyl acetate in presence of sodium ethoxide yields$ (1) $ethyl propionate$ (2) $ethyl butyrate$ (3) $acetoacetic ester$ (4) $methyl acetoacetate$ 45. $Reduction of aldehydes and ketones into hydrocarbons using zinc amalgam and conc. HC1 is called$ (1) $Cope reduction$ (2) $Dow reduction$ (3) $Wolff‐Kishner reduction$ (4) $Clemmensen reduction$ 46. $Conversion of X into Y is an example of the reaction$ (1) $Rosenmund reduction$ (2) $Clemmensen reduction$ (3) $Wolff-Kishner reduction$ (4) $Stephen reduction$ 47. $Identify (Z) in the following reaction. CH_{3} COOH LiAlH_{4} (X) Cu 573 K (Y) dil. NaOH (Z)$ (1) $Aldol$ (2) $Ketol$ (3) $Acetol$ (4) $Butanol$ 48. $Which of the following is Clemmensen reduction?$ (1) $R C O C l H_{2} P d - B a S O_{4} R C H O + H C l$ (2) $R C N S n C l_{2}, H C l H_{3} O^{+} R C H O + N H_{4} C l$ (3) $R C H O Z n - H g, co n cH C l Δ R C H_{3} + H_{2} O$ (4) $R C O R (i) H_{2} N - N H_{2} (ii) KOH, H O - C H_{2} - C H_{2} - O H, Δ R - C H_{2} - R$ 49. $Consider the above reaction sequence and identify the product B.$ (1) (2) (3) (4) 50. $Consider the following sequence of reactions C_{2} H_{4} (i) O_{3} (ii) Zn/H_{2} O P (i) CH_{3} Mg Br/Ether (ii) H_{2} O/H^{+} Q PCC CH_{2} Cl_{2} R The incorrect statement about R is$ (1) $It gives test with Tollen's reagent$ (2) $It undergoes Cannizaro reaction$ (3) $It gives iodoform test$ (4) $It undergoes aldol condensation$ 51. $Two compounds A and B with same molecular formula (C_{3} H_{6} O) undergo Grignard's reaction with methylmagnesium bromide to give products C and D . Products C and D show following chemical tests. Test Cericammoniumnitrate Test Lucas Test Iodoform Test C Positive Turbidity obtained after five minutes Positive D Positive Turbidity obtained immediately Negative C and D respectively are$ (1) $C = H_{3} C - C H_{2} - C H (O H) - C H_{3}; D = H_{3} C - C (C H_{3})_{2} - O H$ (2) $C = H_{3} C - C H_{2} - C H_{2} - C H_{2} - O H; D = H_{3} C - C H_{2} - C H (O H) - C H_{3}$ (3) $C = H_{3} C - C H_{2} - C H_{2} - C H_{2} - O H; D = H_{3} C - C (C H_{3})_{2} - O H$ (4) $C = H_{3} C - C (C H_{3})_{2} - O H; D = H_{3} C - C H_{2} - C H (O H) - C H_{3}$ 52. $The total number of products formed in the following reaction sequence is CH_{3} COCl (i) (CH_{3})_{3} Cd (P) (P) + CH_{3} CHO (ii) NaOH (a q), Δ ?$ (1) $2$ (2) $4$ (3) $1$ (4) $3$ 53. $One mole of a symmetrical alkene on ozonolysis gives two moles of an aldehyde having a molecular mass of 44 u. The alkene is :$ (1) $propane$ (2) $1-butene$ (3) $2-butene$ (4) $ethene$ 54. $Identify the major product obtained in the following reaction [NEET 2023] + 2 (Ag (NH_{3})_{2})^{+} + 3 OH^{-} \to Δ Major product$ (1) (2) (3) (4) 55. $The correct statement about the synthesis of erythritol (C (C H_{2} O H)_{4}) used in the preparation of PETN is:$ (1) $The synthesis requires two aldol condensations and two Cannizzaro reactions.$ (2) $Alpha hydrogens of ethanol and methanol are involved in this reaction.$ (3) $The synthesis requires four aldol condensations between methanol and ethanol.$ (4) $The synthesis requires three aldol condensations and one Cannizzaro reaction$ 56. $Which one is most reactive towards nucleophilic addition reaction?$ (1) (2) (3) (4) 57. $Clemmensen reduction of a ketone is carried out in the presence of which of the following?$ (1) $Glycol with K O H$ (2) $Z n - H g with H C 1$ (3) $L i A l H_{4}$ (4) $H_{2} and Pt as catalyst$ 58. $Acetophenone when reacted with a base, C_{2} H_{5} O N a, yields a stable compound which has the structure$ (1) (2) (3) (4) 59. $From the compounds given below, number of compounds which give positive Fehling's test is______ Benzaldehyde, Acetaldehyde, Acetone,Acetophenone, Methanal, 4-nitrobenzaldehyde, cyclohexane carbaldehyde.$ 60. $Consider all possible isomeric ketones, including stereoisomers of MW = 100. All these isomers are idependently reacted with NaBH4$