In the following halogenated organic compounds the one with maximum...

Percentage of chlorine content = $\dfrac{\text{mass\text{ of } chlorine}}{\text{mass of organic compound}} \times 100$

(A) Chloral $( {CCl}_{3}CHO )$:

Percentage of chlorine content = $\dfrac{3 \times 35 . 5}{147 . 5} \times 100 = 72 . 203$

(B) Gammaxene \left({C}_{6}{H}_{6}{Cl}_{6}\right)$:</p><p>Percentage of chlorine content =$\dfrac{6 \times 35 . 5}{291} \times 100 = 73 . 2 %$</p><p>(C) Chloropicrin${Cl}_{3}C – {NO}_{2}$:</p><p>Percentage of chlorine content =$\dfrac{3 \times 35 . 5}{165} \times 100 = 64 . 54 %$</p><p>(D) Freon-$12 \left({CF}_{2}{Cl}_{2}\right):

Percentage$of$chlorine content = \dfrac{2 \times 35 . 5}{121} \times 100 = 58 . 67 %

As per the percentage of chlorine, Gammaxene has the maximum number of chlorine atoms.