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$4.$ At elevated temperatures, methylisonitrile $(CH,NC$ isomerines to acetonitrile $(CH,CN)$ :

$C{H}_{1}NC(B)C{H}_{1}CN(g)$

The deprndence of the rate constant on temperature is studied and the uraph below is prepared with a slope of $-20000K.$ The energy of metivation of this reaction is kitimol.

a$.4\mathrm{.}4{10}^{-7}$

b$.166$

c$.1\mathrm{.}6{10}^5$

d$.1\mathrm{.}9{10}^4$

c$.4\mathrm{.}4{10}^{-4}$