In which one of the following molecules strongest back donation of an electron pair from halide to boron is expected?
p-Block Elements (Class 11) · Class 11 · JEE Main Previous Year Question
In which one of the following molecules strongest back donation of an electron pair from halide to boron is expected?
- a
- b
- c
- d✓
Strategy: Relate orbital overlap to the extent of back-donation in boron halides.
Step 1: Mechanism Back-donation involves the overlap of a filled -orbital on the halogen with an empty -orbital on Boron. Step 2: Comparison
- In , overlap is , which is highly effective due to similar size and energy.
- In , the overlap is etc., which progressively weakens.
- Therefore, the strongest back-donation occurs in .
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