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Pi and Sigma bonds

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Why or why isn't it possible to have pi bonds between two atoms without there being a sigma bond?

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Source(http://www.bcpl.net/~kdrews/hybridization/hybrids5.html
All atoms require a minimum of one bond to hold two atoms together.
The extra bonds ,when they are found between two atoms, are used to help atoms obey the Octet Rule which states that all covalently bonded atoms will strive to surround themselves with four pairs of electrons, or ...

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The solution discusses why or why isn't it possible to have pi bonds between two atoms without there being a sigma bond.

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Explanation of Ratios

In an unsymmetrical alkene, the boron atom adds predominantly to the least substituted carbon atom. For example, 2-methyl-2-butene gives the products shown below.

CH3-C-CH2-CH3 (also has a CH3 single bonded above the C and a BH2 single bonded below the C) 2%

CH3-CH-C-CH3 (also has a CH3 single bonded above the C in the CH group, an H single bonded above the C by itself, and a BH2 group single bonded below the C by itself) 98%

Explain the ratio obtained.

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