11 hydrogen atoms are present in the hydrocarbon chain having 8 carbon atoms with 3 double bonds.
<h2>Number of hydrogen atoms</h2>
There are 11 hydrogen atoms present in a hydrocarbon chain of 8 carbon atoms with 3 double bonds and the rest single bonds because 5 hydrogen atoms make a single covalent bond with carbon atom whereas the 6 hydrogen atoms make a double covalent bond with carbon atom.
<h3>Double bond</h3>
In double bond, one atom bonded with two atoms so we can conclude that 11 hydrogen atoms are present in the hydrocarbon chain having 8 carbon atoms with 3 double bonds and 5 single bond.