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How do you count pi bonds?

Answer 1

Look at double and triple bonds.

Each double bond is made up of one #pi# bond and one #sigma# bond, and each triple bond is made up of two #pi# bonds and one #sigma# bond (each single bond is made up of just one #sigma# bond).

For example, acetylene has the structure:

It contains one triple bond, so we can conclude that it has two pi bonds.

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Answer 2

Isabella Acosta

To count pi bonds in a molecule, you look at the number of double bonds or triple bonds between atoms. Each double bond counts as one pi bond, and each triple bond counts as two pi bonds.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.