At elevated temperatures, methylisonitrile $(C{H}_{3}NC)$ isomerizes to acetonitrile $(C{H}_{3}CN)$ :

$C{H}_{3}NC(g)C{H}_{3}CN(g)$

The reaction is first order in methylisonitrile. The attached graph shows data for the reaction obtained at $198\mathrm{.}9C.$

The rate constant for the reaction is

$s^{-1}$

$+5\mathrm{.}2*{10}^{-5}$

$+6\mathrm{.}2$

$+1\mathrm{.}9*{10}^4$

$-1\mathrm{.}9*{10}^4$

$-5\mathrm{.}2*{10}^{-5}$