General Organic Chemistry & Isomerism · JEE Main previous year questions

2006 7 questions

1. Q1122006 · 29 Apr 2006 · Shift 1

   The increasing order of stability of the following free radicals is

   1. A.$(C_6{H}_5{)}_2\dot{C}H<(C_6{H}_5{)}_3\dot{C}<(C{H}_3{)}_3\dot{C}<(C{H}_3{)}_2\dot{C}H$
   2. B.$(C{H}_3{)}_2\dot{C}H<(C{H}_3{)}_3\dot{C}<(C_6{H}_5{)}_2\dot{C}H<(C_6{H}_5{)}_3\dot{C}$
   3. C.$(C{H}_3{)}_2\dot{C}H<(C{H}_3{)}_3\dot{C}<(C_6{H}_5{)}_3\dot{C}<(C_6{H}_5{)}_2\dot{C}H$
   4. D.$(C_6{H}_5{)}_3\dot{C}<(C_6{H}_5{)}_2\dot{C}H<(C{H}_3{)}_3\dot{C}<(C{H}_3{)}_2\dot{C}H$
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   Answer: B

2. Q1132006 · 29 Apr 2006 · Shift 1

   $\mathrm{C}{\mathrm{H}}_3\mathrm{Br}+\mathrm{N}{\mathrm{u}}^{-}\to \mathrm{C}{\mathrm{H}}_3\text{-}\mathrm{Nu}+\mathrm{B}{\mathrm{r}}^{-}$ The decreasing order of the rate of the above reaction with nucleophiles ($\mathrm{N}{\mathrm{u}}^{-}$) A to D is [$\mathrm{N}{\mathrm{u}}^{-}=\text{(A)}\mathrm{Ph}{\mathrm{O}}^{-},\text{(B)}\mathrm{Ac}{\mathrm{O}}^{-},\text{(C)}\mathrm{H}{\mathrm{O}}^{-},\text{(D)}\mathrm{C}{\mathrm{H}}_3{\mathrm{O}}^{-}$]

   1. A.$\mathrm{A}>\mathrm{B}>\mathrm{C}>\mathrm{D}$
   2. B.$\mathrm{B}>\mathrm{D}>\mathrm{C}>\mathrm{A}$
   3. C.$\mathrm{D}>\mathrm{C}>\mathrm{A}>\mathrm{B}$
   4. D.$\mathrm{D}>\mathrm{C}>\mathrm{B}>\mathrm{A}$
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   Answer: C

3. Q1142006 · 29 Apr 2006 · Shift 1

   Increasing order of stability among the three main conformations (i.e. Eclipse, Anti, Gauche) of 2- fluoroethanol is

   1. A.Eclipse, Gauche, Anti
   2. B.Gauche, Eclipse, Anti
   3. C.Eclipse, Anti, Gauche
   4. D.Anti, Gauche, Eclipse
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   Answer: C

4. Q1222006 · 29 Apr 2006 · Shift 1

   In the transformation of ${}_{92}^{238}U$ to ${}_{92}^{234}U$, if one emission is an $\alpha$-particle, what should be the other emission(s)?

   1. A.Two ${\beta }^{-}$
   2. B.Two ${\beta }^{-}$ and one ${\beta }^{+}$
   3. C.One ${\beta }^{-}$ and one $\gamma$
   4. D.One ${\beta }^{+}$ and One ${\beta }^{-}$
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   Answer: A

5. Q1342006 · 29 Apr 2006 · Shift 1

   Reaction of trans-2-phenyl-1-bromocyclopentane on reaction with alcoholic KOH produces

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

6. Q1392006 · 29 Apr 2006 · Shift 1
   
   1. A.3-bromo - 1-chlorocyclohexene
   2. B.1-bromo - 3-chlorocyclohexene
   3. C.2-bromo - 6-chlorocyclohex - 1 -ene
   4. D.6-bromo - 2 - chlorocyclohexene
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   Answer: A

7. Q1442006 · 29 Apr 2006 · Shift 1
   
   1. A.
   2. B.
   3. C.
   4. D.
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   Answer: D