Question

bond length b-x is less than the expected pure single b-x bond length in bx3

Answer 1

Answer:

This is due to pπ−pπ back bonding of the fully filled p-orbital of halogen (X) into the empty p-orbital of boron . As a result, B-X bond has some double bond character and hence B-X bond is shorter tha expected.

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Answer 2

Answer:

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The Lewis structure for ethene: The carbon atoms are sp2 hybridized. Two sp2 hybrids bond with the hydrogen atoms, and the other forms a sigma bond with the other carbon atom. The p-orbitals that are unused by the carbon atoms in the hybridization overlap to form the C=C.