What is the number of pi bonds in the molecule below?

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What is the number of pi bonds in the molecule below?

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Answer 1 · 2017-05-26T13:04:02

4.

Explanation:

Most of the carbon-carbon bonds in this molecule (which appears to be a 1,5-hexadiyne) are single and contain only sigma bonds. Each of the carbon-carbon triple bonds involves three pi bonds. There are two triple carbon-carbon bonds in the molecule and therefore we have four pi bonds in the molecule.

(Since the photo was a little bit shaky, here's another condensed structure formula for your reference)
1,5-hexadiyne, ChemSpider, Royal Society of Chemistry
http://www.chemspider.com/Chemical-Structure.62610.html

Answer 2 · 2017-05-26T13:10:56

There are 4 pi bonds in the molecule shown.

Explanation:

Pi bonds are present in double or triple bonds.

A single bond contains $1 σ$ $1sigma$ bond and $0 π$ $0 pi$ bond.
A double bond contains $1 σ$ $1sigma$ and $1 π$ $1pi$ bond.
A triple bond contains $1 σ$ $1sigma$ and $2 π$ $2pi$ bonds.

There are 2 triple bonds in the molecule, therefore, $2 \times 2 = 4 π$ $2xx2=4pi$ bonds.

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What is the number of pi bonds in the molecule below?

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