Aldehydes, Ketones & Acids · JEE Main previous year questions

2022 7 questions

1. Q702022 · 27 Jul 2022 · Shift 2
   
   1. A.(A) – (IV), (B) – (III), (C) – (II), (D) – (I)
   2. B.(A) – (I), (B) – (II), (C) – (III), (D) – (IV)
   3. C.(A) – (II), (B) – (III), (C) – (IV), (D) – (I)
   4. D.(A) – (III), (B) – (II), (C) – (I), (D) – (IV)
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   Answer: A

2. Q692022 · 28 Jun 2022 · Shift 2
   
   1. A.
   2. B.
   3. C.
   4. D.
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   Answer: C

3. Q662022 · 27 Jun 2022 · Shift 1

   'A' and 'B' respectively are: $\mathrm{A}\underset{\text{(2) }\mathrm{Zn}-{\mathrm{H}}_2\mathrm{O}}{\overset{\text{(1) }{\mathrm{O}}_3}{\to }}\text{Ethane-1,2-dicarbaldehyde}+\text{Glyoxal/Oxaldehyde}$ $\mathrm{B}\underset{\text{(2) }\mathrm{Zn}-{\mathrm{H}}_2\mathrm{O}}{\overset{\text{(1) }{\mathrm{O}}_3}{\to }}\text{5-oxohexanal}$

   1. A.1-methylcyclohex-1,3-diene & cyclopentene.
   2. B.Cyclohex-1,3-diene & cyclopentene
   3. C.1-methylcyclohex-1,4-diene & 1-methylcyclopent-1-ene
   4. D.Cyclohex-1,3-diene & 1-methylcyclopent-1-ene
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   Answer: D

4. Q682022 · 27 Jun 2022 · Shift 1
   
   1. A.(B) and (C)
   2. B.(C) and (D)
   3. C.(A) and (D)
   4. D.(A) and (C)
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   Answer: C

5. Q692022 · 27 Jun 2022 · Shift 1

   Given below are two statements : Statement I : In Hofmann degradation reaction, the migration of only an alkyl group takes place from carbonyl carbon of the amide to the nitrogen atom. Statement II : The group is migrated in Hofmann degradation reaction to electron deficient atom. In the light of the above statements, choose the most appropriate answer from the options given below :

   1. A.Both Statement I and Statement II are correct.
   2. B.Both Statement I and Statement II are incorrect.
   3. C.Statement I is correct but Statement II is incorrect.
   4. D.Statement I is incorrect but Statement II is correct.
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   Answer: D

6. Q722022 · 27 Jun 2022 · Shift 2

   Decarboxylation of all six possible forms of diaminobenzoic acids ${\text{C}}_6{\text{H}}_3({\text{NH}}_2{)}_2\text{COOH}$ yields three products A, B and C. Three acids give a product 'A', two acids gives a product 'B' and one acid give a product 'C'. The melting point of product 'C' is

   1. A.$63^{\circ }\text{C}$
   2. B.$90^{\circ }\text{C}$
   3. C.$104^{\circ }\text{C}$
   4. D.$142^{\circ }\text{C}$
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   Answer: D

7. Q712022 · 26 Jun 2022 · Shift 2

   The reagent, from the following, which converts benzoic acid to benzaldehyde in one step is $${\mathrm{C}}_6{\mathrm{H}}_5\mathrm{COOH}⟶{\mathrm{C}}_6{\mathrm{H}}_5\mathrm{CHO}$$

   1. A.$\mathrm{LiAl}{\mathrm{H}}_4$
   2. B.$\mathrm{KMn}{\mathrm{O}}_4$
   3. C.$\mathrm{MnO}$
   4. D.$\mathrm{NaB}{\mathrm{H}}_4$
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   Answer: C