Aldehydes, Ketones & Acids · JEE Main previous year questions

2023 9 questions

1. Q722023 · 13 Apr 2023 · Shift 1

   $$\text{D -(+)- Glyceraldehyde}\underset{\text{iii) }{\mathrm{HNO}}_3}{\overset{\text{i) HCN, ii) }{\mathrm{H}}_{2}O/{\mathrm{H}}^{+}}{\to }}$$ The products formed in the above reaction are

   1. A.Two optically active products
   2. B.One optically active and one meso product
   3. C.Two optically inactive products
   4. D.One optically inactive and one meso product.
   Show answer

   Answer: B

2. Q862023 · 12 Apr 2023 · Shift 1· Numerical answer

   The mass of ${\mathrm{NH}}_3$ produced when $131.8\text{ kg}$ of cyclohexanecarbaldehyde undergoes Tollen's test is _________ kg. (Nearest Integer) Molar Mass of $\mathrm{C}=12\text{ g/mol}$ $\mathrm{N}=14\text{ g/mol}$ $\mathrm{O}=16\text{ g/mol}$

   Show answer

   Answer: 80

3. Q712023 · 11 Apr 2023 · Shift 2
   
   1. A.Both A and R are true and R is the correct explanation of A
   2. B.A is false but R is true
   3. C.A is true but R is false
   4. D.Both A and R are true but R is NOT the correct explanation of A
   Show answer

   Answer: B

4. Q712023 · 8 Apr 2023 · Shift 2

   The descending order of acidity for the following carboxylic acid is- A. $\mathrm{C}{\mathrm{H}}_3\mathrm{COOH}$ B. ${\mathrm{F}}_3\mathrm{C}-\mathrm{COOH}$ C. $\mathrm{ClC}{\mathrm{H}}_2-\mathrm{COOH}$ D. $\mathrm{FC}{\mathrm{H}}_2-\mathrm{COOH}$ E. $\mathrm{BrC}{\mathrm{H}}_2-\mathrm{COOH}$ Choose the correct answer from the options given below:

   1. A.$\mathrm{B}>\mathrm{C}>\mathrm{D}>\mathrm{E}>\mathrm{A}$
   2. B.$\mathrm{D}>\mathrm{B}>\mathrm{A}>\mathrm{E}>\mathrm{C}$
   3. C.$\mathrm{B}>\mathrm{D}>\mathrm{C}>\mathrm{E}>\mathrm{A}$
   4. D.$\mathrm{E}>\mathrm{D}>\mathrm{B}>\mathrm{A}>\mathrm{C}$
   Show answer

   Answer: C

5. Q632023 · 6 Apr 2023 · Shift 1

   For the reaction $${\text{RCH}}_2\text{Br}+{\text{I}}^{-}\stackrel{\text{Acetone}}{\to }{\text{RCH}}_2\text{I}+{\text{Br}}^{-}\text{major}$$ The correct statement is

   1. A.The solvent used in the reaction solvates the ions formed in rate determining step.
   2. B.${\text{Br}}^{-}$ can act as competing nucleophile.
   3. C.The reaction can occur in acetic acid also.
   4. D.The transition state formed in the above reaction is less polar than the localised anion.
   Show answer

   Answer: D

6. Q782023 · 6 Apr 2023 · Shift 1

   Match List I with List II | LIST I (Name of reaction) | LIST II (Reagent used) | | :--- | :--- | | A. Hell-Volhard-Zelinsky reaction | I. $NaOH+I_2$ | | B. Iodoform reaction | II. (i) $Cr{O}_{2}C{l}_2,C{S}_2$ (ii) $H_{2}O$ | | C. Etard reaction | III. (i) $B{r}_2$ / red phosphorus (ii) $H_{2}O$ | | D. Gatterman-Koch reaction | IV. $CO,HCl$, anhyd. $AlC{l}_3$ | Choose the correct answer from the options given below:

   1. A.A-III, B-I, C-IV, D-II
   2. B.A-III, B-I, C-II, D-IV
   3. C.A-I, B-II, C-III, D-IV
   4. D.A-III, B-II, C-I, D-IV
   Show answer

   Answer: B

7. Q692023 · 29 Jan 2023 · Shift 2

   Reaction of propanamide with $\mathrm{B}{\mathrm{r}}_2/KOH(\mathrm{aq})$ produces :

   1. A.Propanenitrile
   2. B.Propylamine
   3. C.Ethylnitrile
   4. D.Ethylamine
   Show answer

   Answer: D

8. Q872023 · 25 Jan 2023 · Shift 2· Numerical answer
   
   Show answer

   Answer: 3

9. Q662023 · 24 Jan 2023 · Shift 2
   
   1. A.Both Statement I and Statement II are true
   2. B.Statement I is false but Statement II is true
   3. C.Statement I is true but Statement II is false
   4. D.Both Statement I and Statement II are false
   Show answer

   Answer: C