MCQ
For the given compounds, the correct order of increasing $pK _{ a }$ value :


- A(E) < (D) < (C) < (B) < (A)
- B(D) < (E) < (C) < (B) < (A)
- C(E) < (D) < (B) < (A) < (C)
- ✓) (B) < (D) < (A) < (C) < (E)

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Reason : Boron shows metallic nature.