Question

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

• A. $14$ and $3$
• B. $17$ and $4$
• C. $16$ and $5$
• D. $15$ and $4$
• E. $16$ and $3$

Answer 1

Answer: (B)

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



$(\because$ 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 $4.$