Which of the following statements is correct regarding  $\mathrm{HCN}$ and $\mathrm{HNC}$ ?

$\mathrm{HCN}$ and $\mathrm{HNC}$ Both produce same ions on ionization statements is correct. 

The reaction is having follows,

$\mathrm{HCN}$ or $\mathrm{HNC}\to {\mathrm{H}}^{+}+{\mathrm{CN}}^{-}\text{or }{\mathrm{NC}}^{-}$

Hence, option A is correct.