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Which one of the following molecular hydrides acts as a Lewis acid?

1. NH3
2. H2O
3. B2H6
4. CH4

Correct answer: B2H6

Solution

B2H6 (diborane) acts as a Lewis acid because it has electron-deficient boron atoms that can accept electron pairs. The other options are not electron-deficient and do not exhibit Lewis acid behavior.

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