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The increasing order of the pK b of the following compound is: (A) | F S N H | H N (B) | CH 3 O S N H | H N (C) | O 2 N S N H | H N (D) | H 3 C S N H | H N

1. (C) < (A) < (D) < (B)
2. (B) < (D) < (C) < (A)
3. (B) < (D) < (A) < (C)
4. (A) < (C) < (D) < (B)

Correct answer: (B) < (D) < (A) < (C)

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