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$\begin{matrix}
O\,\,\,\,\,\,\,\,\,\,\,\,\,\, \\
||\,\,\,\,\,\,\,\,\,\,\,\,\, \\
C{{H}_{3}}-C-Cl-N{{H}_{3}} \\
\end{matrix}$ $\to $ Inter mediate $\to $ product
Given : $\log 3=0.48$
$A.$ Reaction completes in $1000\,s$.
$B.$ The reaction has a half-life of $500\, s$.
$C.$ The time required for $10\, \%$ completion is 25 times the time required for $90 \,\%$ completion.
$D.$ The degree of dissociation is equal to $\left(1-e^{-k t}\right)$.
$E.$ The rate and the rate constant have the same unit.
$(i)\,\,(CH_3)_2CH - CH_2Br \xrightarrow{{{C_2}{H_5}OH}}$ $ (CH_3)_2CH - CH_2OC_2H_5 + HBr$
$(ii)\,\,(CH_3)_2CH - CH_2Br \xrightarrow{{{C_2}{H_5}O^-}} $ $(CH_3)_2CH - CH_2OC_2H_5 + Br^-$
The mechanisms of reactions $(i)$ and $(ii)$ are respectively