<prompt> Feces are disinfected best by -1 formaldehyde5 cresol5 phenolIsopropyl alcohol  <response>: Ans. is b i.e., 5 cresol The most effective disinfectant for general use is a coal-tar disinfectant with a Rideal-Walker RW coefficient of 10 or more such as cresol .- Park 250Agents suitable for disinfection of faeces and urineDisinfectantAmount per litrePercent1 Bleaching powder2 Crude phenol3 Cresot4 Formalin50g100 ml50 ml100 ml510510 