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The hybridisation of the underlined atom is altered in which of the following transformations?

1. AlH₃ is converted into AlH₄⁻
2. H₂O is converted into H₃O⁺
3. NH₃ is converted into NH₄⁺
4. All of the above

Correct answer: AlH₃ is converted into AlH₄⁻

Solution

AlH3 (sp2) -> AlH4- (sp3) changes the Al hybridisation, but H2O -> H3O+ stays sp3 and NH3 -> NH4+ stays sp3. So only the first transformation alters hybridisation, not 'all of the above'.

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