Which of the following compound CANNOT act as a Lewis base?
Ionic Equilibrium · Class 11 · JEE Main Previous Year Question
Which of the following compound CANNOT act as a Lewis base?
- a
- b✓
- c
- d
Lewis base = electron pair donor (must have a lone pair available for donation).
Step 1 — Analyse each compound:
(1) : N has a lone pair can donate Lewis base ✓ (though weakly, due to F withdrawing electrons)
(2) : P has 5 bonds, no lone pairs, and an empty d-orbital acts as Lewis acid (electron acceptor), NOT a Lewis base ✗
(3) : S has one lone pair can donate Lewis base ✓
(4) : Cl has two lone pairs can donate Lewis base ✓
Answer: Option (2) —
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