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test- The Study of Chemical Reactions

krishandeep sandhe
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10 May 2007 21:31:32 IST
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10 May 2007 21:31:32 IST
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test- The Study of Chemical Reactions
Engineering Entrance , JEE Main , JEE Main & Advanced , Chemistry , Organic Chemistry ,
1 .       Which equation correctly expresses the Gibbs free energy of a reaction as a function of the equilibrium constant Keq for the reaction?
  delta.gifG = ?RTln(K)
  G = ?RTln(delta.gifK)
  delta.gifG = ?RTlog(K)
  delta.gifG = +RTln(K)
2 .       What are the correct units of entropy? (K represents the Kelvin temperature.)
  K ? cal/mol
  kcal/mol
  cal/(K ? mol)
  kcal
3 .       Which one of the following describes the rate-limiting propagation step of the bromination of methane? 
  Br? + CH4 -> H-Br + ?CH3
  Br-Br -(light) -> 2 Br?
  ?CH3 + Br-Br -> Br-CH3 + Br?
  Br? + ?CH3 -> BrCH3
4 .       What are the units for the rate constant of a second order reaction?
  liter/(mol ? sec)
  liter/sec
  mol/sec
  1/sec
5 .       The Boltzmann distribution gives the fraction of molecules with a given energy E, f(E), as a function of the energy E. The curve goes through a maximum, f(E)max. How does this maximum shift if the temperature is increased?
  Emax moves to higher energy and decreases in height.
  Emax moves to higher energy and increases in height.
  Emax moves to higher energy with no change in height.
  Emax moves to lower energy and increases in height.
6 .       Which statement best describes the electronic structure of the transition state for hydrogen abstraction from methane by chlorine radical?
  The C-H bond is partially broken; the H-Cl bond is partially formed.
  The C-H bond is completely dissociated; the H-Cl bond is fully formed.
  The C-H bond is broken; the chlorine has not yet begun interacting with the methane.
  The C-H bond is fully formed; the chlorine has not yet begun interacting with the methane molecule.
7 .       If all C-H bonds had the same homolytic dissociation energy (which they do not), what ratio of 1-bromobutane to 2-bromobutane would you find among the products of the free radical bromination of butane?
  1-bromobutane : 2-bromobutane = 1:2
  1-bromobutane : 2-bromobutane = 2:3
  1-bromobutane : 2-bromobutane = 3:2
  1-bromobutane : 2-bromobutane = 2:1
8 .       Which of the following compounds is the major product in the photochemical bromination of 2-methylpentane?
  2-bromo-4-methylpentane
  1-bromo-2-methylpentane
  3-bromo-2-methylpentane
  2-bromo-2-methylpentane
9 .       The C-atom bearing the single, unpaired electron of a radical is normally planar and sp2-hybridized. Which of the following is most likely to contain a non-planar C-atom at the radical site?
  cyclohexyl radical
  allyl radical
  cyclopropyl radical
  methyl radical
10 .       In what ratio are 1-bromobutane and 2-bromobutane actually produced in the bromination of butane?
  1-bromobutane : 2-bromobutane = 3:2
  1-bromobutane : 2-bromobutane = 1:1
  1-bromobutane : 2-bromobutane = 65:1
  1-bromobutane : 2-bromobutane = 1:65
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