General Organic Chemistry & Isomerism · JEE Main previous year questions

2024 41 questions

1. Q712024 · 9 Apr 2024 · Shift 1
   
   1. A.(II) > (I) > (III)
   2. B.(III) > (II) > (I)
   3. C.(I) > (III) > (II)
   4. D.(I) > (II) > (III)
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   Answer: D

2. Q762024 · 9 Apr 2024 · Shift 1

   Methods used for purification of organic compounds are based on :

   1. A.neither on nature of compound nor on the impurity present.
   2. B.presence of impurity only.
   3. C.nature of compound and presence of impurity.
   4. D.nature of compound only.
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   Answer: C

3. Q872024 · 9 Apr 2024 · Shift 1· Numerical answer
   
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   Answer: 4

4. Q682024 · 9 Apr 2024 · Shift 2
   
   1. A.4
   2. B.2
   3. C.8
   4. D.3
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   Answer: C

5. Q652024 · 8 Apr 2024 · Shift 1
   
   1. A.B and D only
   2. B.A and C only
   3. C.C and D only
   4. D.A and B only
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   Answer: A

6. Q682024 · 8 Apr 2024 · Shift 1

   Match List I with List II LIST I (Molecule) A. $\mathrm{N}{\mathrm{H}}_3$ B. $\mathrm{Br}{\mathrm{F}}_5$ C. $\mathrm{PC}{\mathrm{l}}_5$ D. $\mathrm{C}{\mathrm{H}}_4$ LIST II (Shape) I. Square pyramid II. Tetrahedral III. Trigonal pyramidal IV. Trigonal bipyramidal Choose the correct answer from the options given below:

   1. A.A-II, B-IV, C-I, D-III
   2. B.A-III, B-I, C-IV, D-II
   3. C.A-IV, B-III, C-I, D-II
   4. D.A-III, B-IV, C-I, D-II
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   Answer: B

7. Q882024 · 8 Apr 2024 · Shift 1· Numerical answer
   
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   Answer: 32

8. Q772024 · 8 Apr 2024 · Shift 2
   
   1. A.2,5,6-Trimethyloctane
   2. B.2-Ethyl-2,6-diethylheptane
   3. C.3,4,7-Trimethyloctane
   4. D.2-Ethyl-3,6-dimethylheptane
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   Answer: A

9. Q822024 · 8 Apr 2024 · Shift 2· Numerical answer
   
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   Answer: 1

10. Q852024 · 8 Apr 2024 · Shift 2· Numerical answer
    
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    Answer: 1

11. Q672024 · 6 Apr 2024 · Shift 2

    The correct statement among the following, for a "chromatography" purification method is :

    1. A.$R_f$ of a polar compound is smaller than that of a non-polar compound.
    2. B.Non-polar compounds are retained at top and polar compounds come down in column chromatography.
    3. C.Organic compounds run faster than solvent in the thin layer chromatographic plate.
    4. D.$R_f$ is an integral value.
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    Answer: A

12. Q792024 · 6 Apr 2024 · Shift 2

    The incorrect statement regarding the geometrical isomers of 2-butene is :

    1. A.cis-2-butene and trans-2-butene are not interconvertible at room temperature.
    2. B.trans-2-butene is more stable than cis-2-butene.
    3. C.cis-2-butene has less dipole moment than trans-2-butene.
    4. D.cis-2-butene and trans-2-butene are stereoisomers.
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    Answer: C

13. Q832024 · 6 Apr 2024 · Shift 2· Numerical answer
    
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    Answer: 5

14. Q652024 · 5 Apr 2024 · Shift 2

    Match List - I with List - II. $$\begin{array}{llll}& \begin{array}{l}\text{LIST I}\\ \text{(Pair of Compounds)}\end{array}& & \begin{array}{l}\text{LIST II}\\ \text{(Isomerism)}\end{array}\\ \text{A.}& \text{n-propanol and Isopropanol}& \text{I.}& \text{Metamerism}\\ \text{B.}& \text{Methoxypropane and ethoxyethane}& \text{II.}& \text{Chain Isomerism}\\ \text{C.}& \text{Propanone and propanal}& \text{III.}& \text{Position Isomerism}\\ \text{D.}& \text{Neopentane and Isopentane}& \text{IV.}& \text{Functional Isomerism}\end{array}$$ Choose the correct answer from the options given below :

    1. A.(A)-(II), (B)-(I), (C)-(IV), (D)-(III)
    2. B.(A)-(III), (B)-(I), (C)-(II), (D)-(IV)
    3. C.(A)-(III), (B)-(I), (C)-(IV), (D)-(II)
    4. D.(A)-(I), (B)-(III), (C)-(IV), (D)-(II)
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    Answer: C

15. Q832024 · 5 Apr 2024 · Shift 2· Numerical answer
    
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    Answer: 50

16. Q662024 · 4 Apr 2024 · Shift 1

    Identify the correct set of reagents or reaction conditions '$X$' and '$Y$' in the following set of transformation. $$\mathrm{C}{\mathrm{H}}_3-\mathrm{C}{\mathrm{H}}_2-\mathrm{C}{\mathrm{H}}_2-\mathrm{Br}\stackrel{\text{‘}\mathrm{X}\text{’}}{\to }\mathrm{Product}\stackrel{\text{‘}\mathrm{Y}\text{’}}{\to }\mathrm{C}{\mathrm{H}}_3-\underset{\begin{array}{c}|\\ Br\end{array}}{\mathrm{CH}}-\mathrm{C}{\mathrm{H}}_3$$

    1. A.$X=\text{dil.aq. NaOH, }20^{\circ }\mathrm{C},Y=\mathrm{HBr}/\text{ acetic acid}$
    2. B.$X=\text{conc.alc. NaOH, }80^{\circ }\mathrm{C},Y=\mathrm{B}{\mathrm{r}}_2/CHC{\mathrm{l}}_3$
    3. C.$X=\text{dil.aq. NaOH, }20^{\circ }\mathrm{C},Y=\mathrm{B}{\mathrm{r}}_2/CHC{\mathrm{l}}_3$
    4. D.$X=\text{conc.alc. NaOH, }80^{\circ }\mathrm{C},Y=\mathrm{HBr}/\text{ acetic acid}$
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    Answer: D

17. Q882024 · 4 Apr 2024 · Shift 1· Numerical answer

    The number of different chain isomers for ${\mathrm{C}}_7{\mathrm{H}}_{16}$ is ____.

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    Answer: 9

18. Q652024 · 4 Apr 2024 · Shift 2
    
    1. A.$\text{d}>\text{c}>\text{b}>\text{a}$
    2. B.$\text{c}>\text{b}>\text{d}>\text{a}$
    3. C.$\text{d}>\text{a}>\text{c}>\text{b}$
    4. D.$\text{a}>\text{b}>\text{c}>\text{d}$
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    Answer: A

19. Q652024 · 1 Feb 2024 · Shift 1

    In Kjeldahl's method for estimation of nitrogen, $\mathrm{CuS}{\mathrm{O}}_4$ acts as :

    1. A.catalytic agent
    2. B.hydrolysis agent
    3. C.reducing agent
    4. D.oxidising agent
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    Answer: A

20. Q682024 · 1 Feb 2024 · Shift 1

    Ionic reactions with organic compounds proceed through : (A) homolytic bond cleavage (B) heterolytic bond cleavage (C) free radical formation (D) primary free radical (E) secondary free radical Choose the correct answer from the options given below :

    1. A.(A) only
    2. B.(B) only
    3. C.(C) only
    4. D.(D) and (E) only
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    Answer: B

21. Q692024 · 1 Feb 2024 · Shift 1

    Which of the following compound will most easily be attacked by an electrophile?

    1. A.${\mathrm{C}}_6{\mathrm{H}}_5\mathrm{Cl}$
    2. B.${\mathrm{C}}_6{\mathrm{H}}_5\mathrm{OH}$
    3. C.${\mathrm{C}}_6{\mathrm{H}}_6$
    4. D.${\mathrm{C}}_6{\mathrm{H}}_5\mathrm{C}{\mathrm{H}}_3$
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    Answer: B

22. Q822024 · 1 Feb 2024 · Shift 1· Numerical answer
    
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    Answer: 2

23. Q892024 · 1 Feb 2024 · Shift 1· Numerical answer

    Number of optical isomers possible for 2-chlorobutane ________.

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    Answer: 2

24. Q712024 · 1 Feb 2024 · Shift 2

    Lassaigne's test is used for detection of :

    1. A.Phosphorous and halogens only
    2. B.Nitrogen, Sulphur and Phosphorous only
    3. C.Nitrogen, Sulphur, phosphorous and halogens
    4. D.Nitrogen and Sulphur only
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    Answer: C

25. Q742024 · 1 Feb 2024 · Shift 2

    The functional group that shows negative resonance effect is :

    1. A.$-\mathrm{OH}$
    2. B.$-\mathrm{OR}$
    3. C.$-\mathrm{COOH}$
    4. D.$-\mathrm{N}{\mathrm{H}}_2$
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    Answer: C