Organic Reactions & Conversions · JEE Main previous year questions

2019 40 questions

1. Q612019 · 12 Apr 2019 · Shift 1
   
   1. A.
   2. B.
   3. C.
   4. D.
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   Answer: B

2. Q652019 · 12 Apr 2019 · Shift 1
   
   1. A.
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   Answer: D

3. Q722019 · 12 Apr 2019 · Shift 1
   
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   Answer: B

4. Q732019 · 12 Apr 2019 · Shift 1

   In the following reaction; $x\text{A}\to y\text{B}$ ${\log }_{10}\left[-\frac{d[A]}{dt}\right]={\log }_{10}\left[\frac{d[B]}{dt}\right]+0.3010$ 'A' and 'B' respectively can be :

   1. A.n-Butane and Iso-butane
   2. B.${\text{C}}_2{\text{H}}_4$ and ${\text{C}}_4{\text{H}}_8$
   3. C.${\text{C}}_2{\text{H}}_4$ and ${\text{C}}_6{\text{H}}_6$
   4. D.${\text{N}}_2{\text{O}}_4$ and ${\text{NO}}_2$
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   Answer: B

5. Q752019 · 12 Apr 2019 · Shift 1
   
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   3. C.
   4. D.
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   Answer: A

6. Q742019 · 12 Apr 2019 · Shift 2
   
   1. A.
   2. B.
   3. C.
   4. D.
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   Answer: C

7. Q762019 · 12 Apr 2019 · Shift 2
   
   1. A.$CH\equiv CH$
   2. B.$C{H}_3-C\equiv C-C{H}_3$
   3. C.$C{H}_3-C\equiv CH$
   4. D.$C{H}_2=C{H}_2$
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   Answer: C

8. Q672019 · 10 Apr 2019 · Shift 1
   
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   Answer: C

9. Q752019 · 10 Apr 2019 · Shift 1
   
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   Answer: C

10. Q782019 · 10 Apr 2019 · Shift 1
    
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    Answer: C

11. Q612019 · 10 Apr 2019 · Shift 2
    
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    Answer: C

12. Q702019 · 10 Apr 2019 · Shift 2
    
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    Answer: C

13. Q632019 · 9 Apr 2019 · Shift 1

    The major product of the following reaction is : $${\mathrm{C}}_6{\mathrm{H}}_5\mathrm{C}{\mathrm{H}}_2\mathrm{C}{\mathrm{H}}_3\underset{\text{(ii) }{\mathrm{H}}_3{\mathrm{O}}^{+}}{\overset{\text{(i) alkaline }\mathrm{KMn}{\mathrm{O}}_4}{\to }}$$

    1. A.${\mathrm{C}}_6{\mathrm{H}}_5\mathrm{COOH}$
    2. B.${\mathrm{C}}_6{\mathrm{H}}_5\mathrm{C}{\mathrm{H}}_2\mathrm{CHO}$
    3. C.${\mathrm{C}}_6{\mathrm{H}}_5\mathrm{C}{\mathrm{H}}_2\mathrm{COOH}$
    4. D.${\mathrm{C}}_6{\mathrm{H}}_5\mathrm{COC}{\mathrm{H}}_3$
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    Answer: A

14. Q702019 · 9 Apr 2019 · Shift 1

    For a reaction, ${\mathrm{N}}_2(\mathrm{g})+3{\mathrm{H}}_2(\mathrm{g})\to 2N{\mathrm{H}}_3(\mathrm{g})$; identify dihydrogen $({\mathrm{H}}_2)$ as a limiting reagent in the following reaction mixtures.

    1. A.56g of ${\mathrm{N}}_2$ + 10g of ${\mathrm{H}}_2$
    2. B.14g of ${\mathrm{N}}_2$ + 4g of ${\mathrm{H}}_2$
    3. C.28g of ${\mathrm{N}}_2$ + 6g of ${\mathrm{H}}_2$
    4. D.35g of ${\mathrm{N}}_2$ + 8g of ${\mathrm{H}}_2$
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    Answer: A

15. Q762019 · 9 Apr 2019 · Shift 1
    
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    Answer: C

16. Q772019 · 9 Apr 2019 · Shift 1

    The major product of the following reaction is : $\mathrm{C}{\mathrm{H}}_3\mathrm{CH}=\mathrm{CHC}{\mathrm{O}}_2\mathrm{C}{\mathrm{H}}_3\stackrel{\mathrm{LiAl}{\mathrm{H}}_4}{\to }$

    1. A.$\mathrm{C}{\mathrm{H}}_3\mathrm{C}{\mathrm{H}}_2\mathrm{C}{\mathrm{H}}_2\mathrm{CHO}$
    2. B.$\mathrm{C}{\mathrm{H}}_3\mathrm{C}{\mathrm{H}}_2\mathrm{C}{\mathrm{H}}_2\mathrm{C}{\mathrm{O}}_2\mathrm{C}{\mathrm{H}}_3$
    3. C.$\mathrm{C}{\mathrm{H}}_3\mathrm{CH}=\mathrm{CHC}{\mathrm{H}}_2\mathrm{OH}$
    4. D.$\mathrm{C}{\mathrm{H}}_3\mathrm{C}{\mathrm{H}}_2\mathrm{C}{\mathrm{H}}_2\mathrm{C}{\mathrm{H}}_2\mathrm{OH}$
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    Answer: C

17. Q822019 · 9 Apr 2019 · Shift 1

    The major product of the following reaction is : $$\mathrm{C}{\mathrm{H}}_3-\mathrm{C}\equiv \mathrm{CH}\underset{\text{(ii) DI}}{\overset{\text{(i) DCl (1 equiv.)}}{\to }}$$

    1. A.$\mathrm{C}{\mathrm{H}}_3\mathrm{C}{\mathrm{D}}_2\mathrm{CH}(\mathrm{Cl})(\mathrm{I})$
    2. B.$\mathrm{C}{\mathrm{H}}_3\mathrm{CD}(\mathrm{Cl})\mathrm{CHD}(\mathrm{I})$
    3. C.$\mathrm{C}{\mathrm{H}}_3\mathrm{C}(\mathrm{I})(\mathrm{Cl})\mathrm{CH}{\mathrm{D}}_2$
    4. D.$\mathrm{C}{\mathrm{H}}_3\mathrm{CD}(\mathrm{I})\mathrm{CHD}(\mathrm{Cl})$
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    Answer: C

18. Q632019 · 9 Apr 2019 · Shift 2
    
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    3. C.
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    Answer: C

19. Q732019 · 9 Apr 2019 · Shift 2
    
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    Answer: A

20. Q622019 · 8 Apr 2019 · Shift 2
    
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    Answer: D

21. Q652019 · 8 Apr 2019 · Shift 2

    The major product of the following reaction is: $$\mathrm{p}\text{-}\mathrm{Cl}-{\mathrm{C}}_6{\mathrm{H}}_4-\mathrm{C}{\mathrm{H}}_3\underset{\text{(2) }{\mathrm{H}}_2\mathrm{O},\Delta }{\overset{\text{(1) }\mathrm{C}{\mathrm{l}}_2/h\nu }{\to }}$$

    1. A.$\mathrm{p}\text{-}\mathrm{Cl}-{\mathrm{C}}_6{\mathrm{H}}_4-\mathrm{CHO}$
    2. B.$\mathrm{p}\text{-}\mathrm{Cl}-{\mathrm{C}}_6{\mathrm{H}}_4-\mathrm{C}{\mathrm{O}}_2\mathrm{H}$
    3. C.$\mathrm{p}\text{-}\mathrm{Cl}-{\mathrm{C}}_6{\mathrm{H}}_4-\mathrm{C}{\mathrm{H}}_2\mathrm{OH}$
    4. D.$\mathrm{p}\text{-}\mathrm{Cl}-{\mathrm{C}}_6{\mathrm{H}}_4-\mathrm{CHC}{\mathrm{l}}_2$
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    Answer: C

22. Q662019 · 8 Apr 2019 · Shift 2

    The major product of the following reaction is: [reactant: benzene ring with $\mathrm{N}{\mathrm{H}}_2$ at C-1, $\mathrm{COC}{\mathrm{H}}_3$ at C-2 and CN at C-3] $\underset{\text{(ii) }Pd/C/{\mathrm{H}}_2}{\overset{\text{(i) }\mathrm{CHC}{\mathrm{l}}_3/KOH}{\to }}$

    1. A.[benzene ring with $\mathrm{NHC}{\mathrm{H}}_3$ at C-1, $\mathrm{COC}{\mathrm{H}}_3$ at C-2, CN at C-3]
    2. B.[benzene ring with $\mathrm{NHCHC}{\mathrm{l}}_2$ at C-1, $\mathrm{CH}(\mathrm{OH})\mathrm{C}{\mathrm{H}}_3$ at C-2, CN at C-3]
    3. C.[benzene ring with $\mathrm{NHC}{\mathrm{H}}_3$ at C-1, $\mathrm{CH}(\mathrm{OH})\mathrm{C}{\mathrm{H}}_3$ at C-2, CN at C-3]
    4. D.[benzene ring with $\mathrm{NHC}{\mathrm{H}}_3$ at C-1, $\mathrm{CH}(\mathrm{OH})\mathrm{C}{\mathrm{H}}_3$ at C-2, $\mathrm{C}{\mathrm{H}}_2\mathrm{N}{\mathrm{H}}_2$ at C-3]
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    Answer: D

23. Q712019 · 8 Apr 2019 · Shift 2
    
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    Answer: C

24. Q802019 · 8 Apr 2019 · Shift 2
    
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    Answer: B

25. Q662019 · 12 Jan 2019 · Shift 1
    
    1. A.
    2. B.
    3. C.
    4. D.
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    Answer: B