In which of the folowing molecules, vacant orbitals do not participate in bonding :-

In which of the folowing molecules, vacant orbitals do not participate in bonding :-
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In which of the folowing molecules, vacant orbitals do not participate in bonding :- A. `B_(2)H_(6)` B. `Al_(2) ... H_(3)N.BF_(3)]` D. `Si_(2)H_(6)`
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