Aldehydes & Ketones PYQs Set 3 (PDF)

Set 3 of 9 · Questions 61-90 of 264

In the print window choose “Save as PDF”. The file prints without a web address or date line.

Mere Teacher · Previous Year Questions NEET Chemistry · Aldehydes & Ketones · Set 3 (Q61-90)
Scan or visit mereteacher.com for free PYQ practice, timed CBT tests, step-by-step solutions and BroBot AI. Answers and solutions are free with a sign-up.
61. $Reduction by L i A l H_{4} of hydrolysed product of an ester gives$ (1) $two alcohols$ (2) $two aldehydes$ (3) $one acid and one alcohol$ (4) $two acids.$ 62. $When aniline reacts with oil of bitter almonds (C_{6} H_{5} CHO) condensation takes place and benzal derivative is formed. This is known as$ (1) $Schiff’s base$ (2) $Benedict’s reagent$ (3) $Millon’s base$ (4) $Schiff’s reagent.$ 63. $The correct structure of the product A formed in the reaction [NEET 2016] H_{2} (gas, 1 atmosphere) Pd / carbon, ethanol A is$ (1) (2) (3) (4) 64. $The reagent which can be used to distinguish acetophenone from benzophenone is$ (1) $2,4‐dinitrophenylhydrazine$ (2) $aqueous solution of N a H S O_{3}$ (3) $Benedict reagent$ (4) $I_{2} and NaOH. (1990)/C H2-0$ 65. $Which one among the following reaction products gives iodoform test?$ (1) $C H_{3} C H_{2} C H_{2} C \equiv N (i) C_{2} H_{5} M g B r (ii) H_{3} O^{+}$ (2) $(C_{6} H_{5})_{2} C d C H_{3} C O C l$ (3) $C H_{2} = C H C H_{2} C H (O H) C_{6} H_{5} P C C$ (4) $C_{6} H_{5} C H_{2} C N (i) C_{2} H_{5} M g B r (ii) H_{3} O^{+}$ 66. $First product of the reaction between RCHO and N H_{2} N H_{2} is$ (1) $R C H = N N H_{2}$ (2) $R C H = N H$ (3) $R C H_{2} N H_{2}$ (4) $R C O N_{3}$ 67. $In the following reaction product P is$ (1) $R C H_{2} O H$ (2) $R C O O H$ (3) $R C H O$ (4) $R C H_{3}$ 68. $Arrange the following in increasing order of their reactivity for nucleophilic addition reaction$ (1) $(i) < (ii) < (iii) < (iv)$ (2) $(i) < (iv) < (iii) < (ii)$ (3) $(iii) < (ii) < (i) < (iv)$ (4) $(iii) < (i) < (ii) < (iv)$ 69. $What is the IUPAC name of the organic compound formed in the following chemical reaction? [NEET 2021] Acetone (i) C_{2} H_{5} MgBr, Dry ether (ii) H_{2} O, H^{+} Product$ (1) $2-methyl propan 2-ol$ (2) $pentan-2-ol$ (3) $pentan-3-ol$ (4) $2-methyl butan-2-ol$ 70. $Which of the following compounds does not undergo haloform reaction?$ (1) $C H_{3} - C H (O H) - C H_{3}$ (2) $C H_{3} - C (= O) - C H_{3}$ (3) $C_{2} H_{5} - C H (O H) - C_{2} H_{5}$ (4) $C H_{3} - C (= O) - C_{2} H_{5}$ 71. $The main reactants involved in Etard reaction are$ (1) $Toluene + CrO_{2} Cl_{2}$ (2) $Toluene + CrO_{3} + (CH_{3} CO)_{2} O$ (3) $Toluene + Cl_{2} / hv$ (4) $Benzene + CO + HCl / Anhy \cdot AlCl_{3}$ 72. $The major product of the following reactions is$ (1) (2) (3) (4) 73. $Which of the following arrangements with respect to their reactivity in nucleophilic addition reaction is correct?$ (1) $acetophenone < benzaldehyde < p-tolualdehyde < p- nitrobenzaldehyde$ (2) $benzaldehyde < acetophenone < p-nitrobenzaldehyde < p -tolualdehyde$ (3) $p- nitrobenzaldehyde < benzaldehyde < p-tolualdehyde < acetophenone$ (4) $acetophenone < p-tolualdehyde < benzaldehyde < p - nitrobenzaldehyde$ 74. $Treatment of cyclopentanone with methyl lithium gives which of the following species?$ (1) $Cyclopentanonyl anion$ (2) $Cyclopentanonyl cation$ (3) $Cyclopentanonyl radical$ (4) $Cyclopentanonyl biradical$ 75. $Choose the incorrect statement among the following. A. The reactivity of aromatic aldehydes and ketones is less than that of aliphatic carbonyl compounds toward nucleophilic addition reactions. B. Benzaldehyde does not give Fehling's test. C. The H -atoms in ethanal are acidic in nature. D. p-nitrobenzaldehyde is less reactive than benzaldehyde towards nucleophilic addition reactions.$ (1) $A$ (2) $B$ (3) $C$ (4) $D$ 76. $An organic compound X having molecular formula C_{5} H_{10} O yields phenyl hydrazone and gives negative response to the iodoform test and Tollen's test. It produces n -pentane on reduction. X could be$ (1) $pentanal$ (2) $2-pentanone$ (3) $3-pentanone$ (4) $n-amyl alcohol$ 77. $Which one of the following can be oxidised to the corresponding carbonyl compound?$ (1) $2‐Hydroxypropane$ (2) $ortho‐Nitrophenol$ (3) $Phenol$ (4) $2‐Methyl‐2‐hydroxypropane$ 78. $Which of the following reactions will give benzophenone as major product?(A) Benzoyl chloride + Benzene + AlCl_{3} (anhyd.)(B) Benzoyl chloride + Phenylmagnesium bromide (excess)(C) Benzoyl chloride + Diphenyl cadmium$ (1) $A and B only$ (2) $B and C only$ (3) $A and C only$ (4) $A, B and C$ 79. $The major product of the following reaction is: CH_{3} CH_{2} CH = O \to excess HCHO alkali arkili ?$ (1) $C H_{3} - C (C H_{2} - O H)_{3}$ (2) $C H_{3} - C H_{2} - C H_{2} -OH$ (3) $C H_{3} - C (= C H_{2}) - C H = O$ (4) $C H_{3} - C H (C H_{2} - O H) - C H = O$ 80. $Identify the reaction in which carbonyl group of aldehydes and ketones is reduced to methylene group on treatment with hydrazine followed by heating with sodium hydroxide in ethylene glycol.$ (1) $Wolff-Kishner reduction$ (2) $Clemmensen reduction$ (3) $Stephen reaction$ (4) $Etard reaction$ 81. $Consider the following reactions, What are the structures of Y and Z ?$ (1) (2) (3) (4) 82. $A mixture of benzaldehyde and formaldehyde when treated with 50 % NaOH yields$ (1) $sodium benzoate and sodium formate$ (2) $sodium formate and benzyl alcohol$ (3) $sodium benzoate and methyl alcohol$ (4) $benzyl alcohol and methyl alcohol.$ 83. $Which of the following compounds when treated with dibenzyl cadmium yields benzyl methyl ketone?$ (1) $Acetone$ (2) $Acetaldehyde$ (3) $Acetic acid$ (4) $Acetyl chloride$ 84. $Which of the following reactions will not result in the formation of carbon‐carbon bonds?$ (1) $Reimer‐Tiemann reaction$ (2) $Cannizzaro reaction$ (3) $Wurtz reaction$ (4) $Friedel‐Crafts acylation$ 85. $Which among the following aldehydes is most reactive towards nucleophilic addition reactions?$ (1) $C_{3} H_{7} - C (= O) - H$ (2) $C_{2} H_{5} - C (= O) - H$ (3) $C H_{3} - C (= O) - H$ (4) $H - C (= O) - H$ 86. $The major product obtained from the following reaction is \to H_{2} O \frac{Hg ^{2 +}}{H ^{+}}$ (1) (2) (3) (4) 87. $The major product in the following transformation is$ (1) (2) (3) (4) 88. $Which one of the following compounds will be most readily dehydrated?$ (1) (2) (3) (4) 89. $Which alkene on ozonolysis gives C H_{3} C H_{2} C H O and C H_{3} C O C H_{3} ?$ (1) $C H_{3} C H_{2} C H = C (C H_{3})_{2}$ (2) $C H_{3} C H_{2} C H = C H C H_{2} C H_{3}$ (3) $C H_{3} C H_{2} C H = C H C H_{3}$ (4) $C H_{3} - C H (C H_{3}) = C H C H_{3}$ 90. $The major product of the following reaction is: \frac{( i ) KMn O _{4} / KOH / ∆}{( ii ) H _{2} S O _{4} ( dil )}$ (1) (2) (3) (4)