Which of the following base is weakest

  • A

    $N{H_4}OH:{K_b} = 1.6 \times {10^{ - 6}}$

  • B

    ${C_6}{H_5}N{H_2}:{K_b} = 3.8 \times {10^{ - 10}}$

  • C

    ${C_2}{H_5}N{H_2}:{K_b} = 5.6 \times {10^{ - 4}}$

  • D

    ${C_6}{H_7}N:{K_b} = 6.3 \times {10^{ - 10}}$

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