The equivalent conductance of $1 \, M$ benzoic acid is $12.8 \, \text{mho} \, \text{cm}^2 \, \text{g-eq}^{-1}$. If the molar conductivities of benzoate ion and $H^+$ ion are $42$ and $288.42 \, Omega^{-1} \, \text{cm}^2$ respectively,then the degree of dissociation is .......... $\%$.

  • A
    $39$
  • B
    $3.9$
  • C
    $35$
  • D
    $0.039$

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