\({K_1}\, = \,\,\frac{{2.303}}{t}\log \frac{a}{{a\, - \,\,x}}\)
\(\Rightarrow \,\frac{{0.693}}{{6.93}}\, = \,\frac{{2.303}}{t}\log \frac{{100}}{1}\)
\(t = 46.06\,\min\)
( $\mathrm{R}=8.314 \mathrm{~J} \mathrm{~K}^{-1} \mathrm{~mol}^{-1}, \log 4=0.6021$ આપેલ છે.)