General Organic Chemistry & Isomerism · JEE Main previous year questions

2024 41 questions

1. Q792024 · 1 Feb 2024 · Shift 2

   Which of the following compounds show colour due to d-d transition?

   1. A.${\mathrm{K}}_2\mathrm{C}{\mathrm{r}}_2{\mathrm{O}}_7$
   2. B.$\mathrm{CuS}{\mathrm{O}}_4\cdot 5{\mathrm{H}}_2\mathrm{O}$
   3. C.$\mathrm{KMn}{\mathrm{O}}_4$
   4. D.${\mathrm{K}}_2\mathrm{Cr}{\mathrm{O}}_4$
   Show answer

   Answer: B

2. Q832024 · 1 Feb 2024 · Shift 2· Numerical answer

   Total number of isomeric compounds (including stereoisomers) formed by monochlorination of 2- methylbutane is _______ .

   Show answer

   Answer: 6

3. Q652024 · 31 Jan 2024 · Shift 1

   A species having carbon with sextet of electrons and can act as electrophile is called

   1. A.pentavalent carbon
   2. B.carbon free radical
   3. C.carbanion
   4. D.carbocation
   Show answer

   Answer: D

4. Q792024 · 31 Jan 2024 · Shift 1

   Given below are two statements: Statement I: IUPAC name of $\mathrm{HO}-\mathrm{C}{\mathrm{H}}_2-(\mathrm{C}{\mathrm{H}}_2{)}_3-\mathrm{C}{\mathrm{H}}_2-\mathrm{COC}{\mathrm{H}}_3$ is 7-hydroxyheptan-2-one. Statement II: 2-oxoheptan-7-ol is the correct IUPAC name for above compound. In the light of the above statements, choose the most appropriate answer from the options given below:

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

   Answer: B

5. Q832024 · 31 Jan 2024 · Shift 2· Numerical answer

   Number of isomeric products formed by monochlorination of 2-methylbutane in presence of sunlight is ________.

   Show answer

   Answer: 6

6. Q892024 · 30 Jan 2024 · Shift 1· Numerical answer

   On a thin layer chromatographic plate, an organic compound moved by $3.5\text{ cm}$, while the solvent moved by $5\text{ cm}$. The retardation factor of the organic compound is _________ $\times 10^{-1}$.

   Show answer

   Answer: 7

7. Q702024 · 29 Jan 2024 · Shift 2

   The correct IUPAC name of ${\mathrm{K}}_2\mathrm{Mn}{\mathrm{O}}_4$ is

   1. A.Potassium tetraoxidomanganate (VI)
   2. B.Dipotassium tetraoxidomanganate (VII)
   3. C.Potassium tetraoxopermanganate (VI)
   4. D.Potassium tetraoxidomanganese (VI)
   Show answer

   Answer: A

8. Q752024 · 29 Jan 2024 · Shift 2
   
   1. A.
   2. B.
   3. C.
   4. D.
   Show answer

   Answer: A

9. Q742024 · 27 Jan 2024 · Shift 1
   
   1. A.Benzenoid aromatic
   2. B.Benzenoid non-aromatic
   3. C.Acyclic
   4. D.Alicyclic
   Show answer

   Answer: D

10. Q772024 · 27 Jan 2024 · Shift 1
    
    1. A.1-Ethyl-5,5-dimethylcyclohexane
    2. B.3-Ethyl-1,1-dimethylcyclohexane
    3. C.1-Ethyl-3,3-dimethylcyclohexane
    4. D.1,1-Dimethyl-3-ethylcyclohexane
    Show answer

    Answer: B

11. Q852024 · 27 Jan 2024 · Shift 1· Numerical answer

    3-Methylhex-2-ene on reaction with $\text{HBr}$ in presence of peroxide forms an addition product (A). The number of possible stereoisomers for 'A' is _______.

    Show answer

    Answer: 4

12. Q862024 · 27 Jan 2024 · Shift 1· Numerical answer
    
    Show answer

    Answer: 3

13. Q622024 · 27 Jan 2024 · Shift 2
    
    1. A.$\text{I}=\text{II}=\text{III}$
    2. B.$\text{I}>\text{II}>\text{III}$
    3. C.$\text{III}>\text{II}>\text{I}$
    4. D.$\text{II}>\text{I}>\text{III}$
    Show answer

    Answer: B

14. Q652024 · 27 Jan 2024 · Shift 2

    The technique used for purification of steam volatile water immiscible substances is :

    1. A.Fractional distillation
    2. B.Distillation
    3. C.Fractional distillation under reduced pressure
    4. D.Steam distillation
    Show answer

    Answer: D

15. Q762024 · 27 Jan 2024 · Shift 2

    The incorrect statement regarding conformations of ethane is :

    1. A.The dihedral angle in staggered conformation is $60^{\circ }$.
    2. B.Ethane has infinite number of conformations.
    3. C.Eclipsed conformation is the most stable conformation.
    4. D.The conformations of ethane are inter-convertible to one-another.
    Show answer

    Answer: C

16. Q832024 · 27 Jan 2024 · Shift 2· Numerical answer
    
    Show answer

    Answer: 5