Number of electron deficient molecules among the following , LiH and is

Question

Number of electron deficient molecules among the following , LiH and  is

Canvas Classes · Accepted Answer

Electron deficient molecules have the central atom with fewer than 8 electrons in their Lewis structure.

Step 1 — Analyse each molecule:

- : P has 8e⁻ (3 bonds + 1 lone pair) → NOT electron deficient
- : B has only 6e⁻ (3 bonds, no lone pair) → Electron deficient ✓
- : C has 8e⁻ → NOT electron deficient
- : N has 8e⁻ → NOT electron deficient
- LiH: ionic compound, not applicable in this context → NOT electron deficient
- : B has 6e⁻ → Electron deficient ✓

Step 2 — Count:  and  → 2 molecules

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