Elevation in the boiling point for 1 molal solution of glucose is 2K. The depression in the freezing point of 2 molal solutions of glucose in the same solvent is 2K. The relation between K_b and K_f is

• A

  ${\mathrm{K}}_{\mathrm{b}}=0.5{\mathrm{K}}_{\mathrm{f}}$
• Correct answer
  B

  ${\mathrm{K}}_{\mathrm{b}}=2{\mathrm{K}}_{\mathrm{f}}$
• C

  ${\mathrm{K}}_{\mathrm{b}}=1.5{\mathrm{K}}_{\mathrm{f}}$
• D

  ${\mathrm{K}}_{\mathrm{b}}={\mathrm{K}}_{\mathrm{f}}$

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