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  4. The number of sigma (σ )and pi (π) bonds present in 1, 3, 5, 7 - octatetraene respectively are

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Q. The number of sigma $\left(\sigma \right)$and pi $\left(\pi\right)$ bonds present in $1, 3, 5, 7$ - octatetraene respectively are

KEAMKEAM 2012Hydrocarbons

Solution:

The structure of $1,3,5,7$ -octatetraine is as

image

$(\because$ Each single bond is a $\sigma$ bond and a double bond contains one $\sigma$ and one $\pi$ bond).

$\therefore $ The number of $\sigma$ and $\pi$ bonds are respectively 17 and $4 .$