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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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