For the first order reaction, X→Y the time taken for 93.75% completion of the reaction is 360 minutes. Time taken for 75% completion of the reaction will be ------ minutes

t93.75%t50%=2.303K log 100100-93.752.303K log 100100-50; t93.75%t50%=4 log 2 log 2 t93.75%=4t50%; Conclusion :       t99.9%=10t50%;        t75%=2t50%;     t87.5%=3t50%;   t93.75%=4t50%; t 96.875%=5t50%;