Which of the two stereoisomers of $4-t-$butylcyclohexyl iodide $(^{127}I^-)$ will undergo $S_N2$ substitution with $^{128}I^-$ faster,and why?

  • A
    $A$ will react faster because it is the more stable of the two isomers.
  • B
    $A$ will react faster because it will yield a more stable product,and the transition state for both reactions is of the same energy.
  • C
    $A$ will react faster because the approach of $^{128}I^-$ can occur unhindered.
  • D
    $B$ will react faster because it is less stable than $A$,and the transition state for both reactions is of the same energy.

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$(II) \ \text{2-methylcyclohexyl chloride}$
$(III) \ \text{Chlorocyclohexane}$
$(IV) \ CH_3-CH(Br)-CH_2-CH_3$

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