Question #16a6f

Mar 17, 2014

$21$

Explanation:

Let us look at the structure of the acetylsalicylic acid, also called aspirin.

Look at the following image

Each double bond (shown as $=$) has one sigma bond and one pi bond. Each single bond (shown as $-$) is a sigma bond.

Count the bonds to get $21$ sigma and $5$ pi bonds.