Chemistry - CHEMICAL BONDING Question with Solution | TestHub

The incorrect orders are B, C, and D.

Option A is correct: BF₃ < BCl₃ < BBr₃ (Lewis acidic character). Due to back-bonding, the Lewis acidity decreases as the size of the halogen increases. BF₃ has the strongest back-bonding, making it the least acidic.

Option B is incorrect: NO₂⁺ > NO₂⁻ > NO₃⁻ (Bond angle). The correct order is NO₂⁺ (180°) > NO₃⁻ (120°) > NO₂⁻ (115°).

Option C is incorrect: CH₂ < CF₂ < CCl₂ (Stability of Carbene). The correct order is CF₂ > CCl₂ > CH₂. Electronegative halogens stabilize carbenes.

Option D is incorrect: CO₃²⁻ < CO₂ < CO (C-O Bond length). The correct order is CO₃²⁻ (1.29 Å) > CO₂ (1.16 Å) > CO (1.13 Å). Bond length decreases with increasing bond order.