General Organic Chemistry & Isomerism · JEE Main previous year questions

2020 14 questions

1. Q582020 · 6 Sept 2020 · Shift 1

   Which of the following compounds shows geometrical isomerism?

   1. A.2-methylpent-1-ene
   2. B.4-methylpent-1-ene
   3. C.2-methylpent-2-ene
   4. D.4-methylpent-2-ene
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   Answer: D

2. Q712020 · 6 Sept 2020 · Shift 1· Numerical answer

   In an estimation of bromine by Carius method, $1.6\text{ g}$ of an organic compound gave $1.88\text{ g}$ of $\mathrm{AgBr}$. The mass percentage of bromine in the compound is ______ . (Atomic mass, $\mathrm{Ag}=108$, $\mathrm{Br}=80\mathrm{g}\mathrm{mo}{\mathrm{l}}^{-1}$)

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   Answer: 50

3. Q522020 · 6 Sept 2020 · Shift 2
   
   1. A.2-nitro-4-hydroxymethyl-5-amino benzaldehyde
   2. B.3-amino-4-hydroxymethyl-5-nitro benzaldehyde
   3. C.4-amino-2-formyl-5-hydroxymethyl nitrobenzene
   4. D.5-amino-4-hydroxymethyl-2-nitro benzaldehyde
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   Answer: D

4. Q692020 · 6 Sept 2020 · Shift 2

   The element that can be refined by distillation is :

   1. A.gallium
   2. B.nickel
   3. C.zinc
   4. D.tin
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   Answer: C

5. Q562020 · 3 Sept 2020 · Shift 1
   
   1. A.
   2. B.
   3. C.
   4. D.
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   Answer: D

6. Q632020 · 3 Sept 2020 · Shift 1
   
   1. A.(a) and (b)
   2. B.(a), (b) and (c)
   3. C.(a) and (c)
   4. D.(b) and (d)
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   Answer: B

7. Q732020 · 3 Sept 2020 · Shift 1· Numerical answer
   
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   Answer: 8

8. Q612020 · 2 Sept 2020 · Shift 1
   
   1. A.2, 5-dimethyl-6-carboxy-hex-3-enal
   2. B.6-formyl-2-methyl-hex-3-enoic acid
   3. C.2, 5-dimethyl-5-carboxy-hex-3-enal
   4. D.2, 5-dimethyl-6-oxo-hex-3-enoic acid
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   Answer: D

9. Q632020 · 2 Sept 2020 · Shift 1
   
   1. A.
   2. B.
   3. C.
   4. D.
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   Answer: B

10. Q722020 · 2 Sept 2020 · Shift 1· Numerical answer
    
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    Answer: 5

11. Q602020 · 2 Sept 2020 · Shift 2

    The one that is not expected to show isomerism is :

    1. A.$[\mathrm{Pt}(\mathrm{N}{\mathrm{H}}_3{)}_2\mathrm{C}{\mathrm{l}}_2]$
    2. B.$[\mathrm{Ni}(\mathrm{N}{\mathrm{H}}_3{)}_4({\mathrm{H}}_2\mathrm{O}{)}_2{]}^{2+}$
    3. C.$[\mathrm{Ni}(\mathrm{en}{)}_3{]}^{2+}$
    4. D.$[\mathrm{Ni}(\mathrm{N}{\mathrm{H}}_3{)}_2\mathrm{C}{\mathrm{l}}_2]$
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    Answer: D

12. Q652020 · 2 Sept 2020 · Shift 2
    
    1. A.
    2. B.
    3. C.
    4. D.
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    Answer: C

13. Q752020 · 8 Jan 2020 · Shift 1· Numerical answer

    The number of chiral centres in penicillin is _________.

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    Answer: 3

14. Q752020 · 7 Jan 2020 · Shift 1· Numerical answer

    The number of chiral carbons in chloramphenicol is

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    Answer: 2