Question

Which of the following species contain coordinate bond?

• A. $AlC{l}_3$
• B. Hydronium ion
• C. $H_2$
• D. Ammonium ion

Answer 1

Answer: (B), (D)

Ammonium ion
Hydronium ion

Option A:$Al{Cl}_3$ is an ionic species.

$Al{Cl}_3⟶\left[{Al}^{3+}\right]{\left[{Cl}^{-}\right]}_3$

No co ordinate bond.

Option B: (Image 1)

Option C: ${\left[Fe{\left(CN\right)}_6\right]}^{4-}$ is a complex anion.

The ligands (donors) in any complex compound form co ordinate bonds with the central atom.

Option D:$N_3^{-}$ (Azide ion)

Lewis structure

(Image 2)

$\therefore$Correct options: B,C and D