Question

Polychlorinated biphenyls, PCBs, known to be dangerous environment pollutants , are a group of compounds with the general empirical formula `C_12H_mCl_(10-m)`, where m is an integer. What is the value of m, if percentage of carbon atom in the compounds is 40 ?

Answer 1

Correct Answer - 4
% of cation =`144/(144+m+36.5(10-m))xx100=40`
On solving m=4