An ethyne molecule, also known as acetylene, has four covalent bonds. Here's the breakdown:

- Two carbon atoms: Each carbon atom has four valence electrons. To achieve a stable electron configuration, they share three electron pairs with each other through covalent bonds, forming a triple bond between the two carbon atoms (C≡C).

- Two hydrogen atoms: Each carbon atom also forms a single covalent bond with a hydrogen atom by sharing electron pairs.