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(B) The percentage of chlorine is calculated as: $\% 	ext{ of chlorine} = \frac{	ext{Mass of chlorine}}{	ext{Molar mass of compound}} 	imes 100$$1

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Pyrene

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(B) The percentage of chlorine is calculated as: $\% 	ext{ of chlorine} = \frac{	ext{Mass of chlorine}}{	ext{Molar mass of compound}} 	imes 100$$1$. Chloral $(CCl_3CHO)$: Molar mass $= 147.5 \ g/mol$. Mass of $Cl = 3 	imes 35.5 = 106.5 \ g$. $\% \ Cl = (106.5 / 147.5) 	imes 100 \approx 72.20\%$$2$. Pyrene $(CCl_4)$: Molar mass $= 154 \ g/mol$. Mass of $Cl = 4 	imes 35.5 = 142 \ g$. $\% \ Cl = (142 / 154) 	imes 100 \approx 92.21\%$$3$. $PVC$ $(C_2H_3Cl)_n$: The monomer is $CH_2=CHCl$. Molar mass $= 62.5 \ g/mol$. Mass of $Cl = 35.5 \ g$. $\% \ Cl = (35.5 / 62.5) 	imes 100 \approx 56.80\%$$4$. Gammexene $(C_6H_6Cl_6)$: Molar mass $= 291 \ g/mol$. Mass of $Cl = 6 	imes 35.5 = 213 \ g$. $\% \ Cl = (213 / 291) 	imes 100 \approx 73.19\%$Comparing the values,Pyrene $(CCl_4)$ has the highest percentage of chlorine.

Among the following,the compound with the highest percentage of chlorine is:

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