An unknown chlorohydrocarbon has 3.55 % of chlorine. If each molecule of the hydrocarbon has one chlorine atom only; chlorine atoms present in 1 g of chlorohydrocarbon are :(Atomic wt. of $\mathrm{Cl}=35.5\mathrm{ }\mathrm{u};$ Avogadro constant $=6.023\times {10}^{23}\mathrm{ }{\mathrm{mol}}^{–1}$)

• A

  $6.023 \times {10}^9$
• B

  $6.023 \times {10}^{23}$
• C

  $6.023 \times {10}^{21}$
• Correct answer
  D

  $6.023 \times {10}^{20}$

Hence, the correct answer is option: 'D'.