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

  • NH3

  • H2O

  • B2H6

  • CH4

Answer

C.

B2H6

Electron deficient molecules behave as Lewis acid.
Among the given molecules, only diborane is electron deficient, ie, does not have a complete octet. Thus, it acts as a Lewis acid. 
NH3 and H2O being electron rich molecules behave as Lewis base.

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