Which equation represents a single replacement reaction? !

If a molecule with a molecular formula of c13h18 is treated with an excess of h2 in the presence of finally divided pt metal under conditions required for maximum hydrogenation of the molecule to give a molecule with a formula c13h24, how many rings are in the molecule?

What produces wave a)sound b) heats c)transfer of energy d)vibrations

How do i turn 2 s into one in the products