What is the number of carbon atoms in a cycloalkyne with 8 hydrogen atoms

The missing component to the table to the right or indicated with orange letters complete the table by filling in the corresponding numbers or symbols

Tell me the iupac name of the following compounds:

Choose an equation that represents an enzyme-catalyzed reaction. (a) enzyme + substrate → enzyme-substrate complex (b) enzyme + substrate ←−→ enzyme + products (c) enzyme + substrate ←−→ enzyme-substrate complex → enzyme + products (d) enzyme + substrate ←−→ enzyme-substrate complex → enzyme-substrate complex + products