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... e.
Because bonded atoms form multiple bonds, there must be one and only one σ bond, but there can be one or two π bonds.
Generally, σ bonds are formed in a "head-on" manner.
The degree of electron cloud overlap is large, making it relatively stable.
Whereas π bonds are formed in a "side-by-side" manner.
The degree of electron cloud overlap is small, making them unstable.
For example, when alkenes undergo addition reactions with Br2, it is the π bon ...
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