For the given plot, log‌t1∕2 is constant for allconcentration terms (a), means the reaction is of first order i.e. n=1 where, n= order of reaction For first order, t1∕2=
2.303
k
.log‌
a
a−x
t1∕2=
2.303
k
‌log‌
a
a∕2
where, k= rate constant a= initial concentration x= concentration at t=t1∕2 t1∕2= Half-life of the reaction t1∕2=