Calculate Vant Hoff factor for $0.2\mathrm{}\mathrm{m}$ aqueous solution of $\mathrm{K}\mathrm{C}\mathrm{l}$ which freezes at $-{0.680}^{\mathrm{o}}\mathrm{C}.\mathrm{}\left({\mathrm{K}}_{\mathrm{f}}=1.86\mathrm{}\mathrm{K}\mathrm{}\mathrm{k}\mathrm{g}\mathrm{}{\mathrm{m}\mathrm{o}\mathrm{l}}^{-1}\right)$

• A

  $3.72$
• Correct answer
  B

  $1.83$
• C

  $6.8$
• D

  $1.86$

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