WHICH OF THE FOLLOWNG MOLECULES FORM 2ELECTRON 3 CENTERED BONDSAL2CL6 HG2CL2 B2H6 BH3AND WHY EXP. IN DTAL

Dear Raj,

B₂H_{6 is the answer,}

The monomer BH₃ is unstable since the boron atom is only surrounded by six valence electrons, and thus, to form a stable octet, shares electrons with a B-H bond on another boron atom, forming a B-H-B 3-center-2-electron bond. In diborane, there are two such bonds: two H atoms bridge the two B atoms, leaving two additional H atoms in ordinary B-H bonds on each B.

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