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WHICH OF THE FOLLOWNG MOLECULES FORM 2ELECTRON 3 CENTERED BONDS AL2CL6 HG2CL2 B2H6 BH3 AND WHY EXP. IN DTAL

WHICH OF THE FOLLOWNG MOLECULES FORM 2ELECTRON 3 CENTERED BONDS


    AL2CL6     HG2CL2     B2H6       BH3


    AND WHY EXP. IN DTAL

Grade:11

1 Answers

suryakanth AskiitiansExpert-IITB
105 Points
13 years ago

Dear Raj,

B2H6 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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