For reaction $A\rightarrow B$,what is the time taken for which $[A_t]=1M$.Given :$K=2sec^{-1},[A_o]=10M$.

Question

$\begin{array}{1 1}(a)\;1sec&(b)\;2.303sec\\(c)\;4.606sec&(d)\;\large\frac{2.303}{2}\normalsize sec\end{array}$