[" 12.Initial concentration of reactant for "n^(" th ")" order reaction is 'a'.Which of the following relations is ca "],[" about "t_((1)/(2))" of the reaction? "],[[" a) In "t_((1)/(2))=ln(" constant ")-(n-1)log_(e)a," b) "ln(t_(1))/(2)=ln n+ln(" constant ")-ln a],[" c) "(t_(1))/(2)ln=ln(" constant ")+ln a_(0)," d) "ln(t_(1))/(2)=n ln a_(0)]]