Question

Observe the following species \[ \text{AlCl}_3, \, \text{NH}_3, \, \text{H}^+, \, \text{Co}^{3+}, \, \text{OH}^-, \, \text{H}\text{Mg}^{2+}, \, \text{BF}_3, \, \text{Cl}^- \] How many Lewis bases are present in the above list?

• A. 2
• B. 5
• C. 4
• D. 3

Hint:

To identify Lewis bases, look for species that have lone pairs of electrons that can be donated to form bonds with other species.

Answer 1

The Correct Option is C

Lewis bases are species that donate electron pairs. In the list, the following species are Lewis bases:
- \( \text{NH}_3 \) (ammonia)
- \( \text{OH}^- \) (hydroxide)
- \( \text{Cl}^- \) (chloride)
- \( \text{H}\text{Mg}^{2+} \) (magnesium ion)
Thus, the total number of Lewis bases is 4.