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Question
The total number of pi-electrons in the following structure is:
The total number of pi-electrons in the following structure is:
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Solution
The correct option is B eight
When multiple bonds are formed between two atoms, only one bond is sigma bond and other bonds are pi bonds.
There are four double bonds in the above structure.
So, there are four pi bonds.
Each pi bond is formed by two electrons.
Hence, total number of pi-electrons are eight. 
When multiple bonds are formed between two atoms, only one bond is sigma bond and other bonds are pi bonds.
There are four double bonds in the above structure.
So, there are four pi bonds.
Each pi bond is formed by two electrons.
Hence, total number of pi-electrons are eight.
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