Social & Preventive Medicine General c478ac0d Percentage of para-para isomer in DDT is ? A 20-30% B 40-50% C 60-70% D 70-80% High-Yield Explanation Ans. is 'd' i.e., 70-80% o DDT is an amorphous white powder. o Para-para isomer is the most active fraction ---> contains 70-80% of para-para isomers.