Final answer:
Acetylene (C₂H₂) can react with hydrogen (H₂) to form ethylene (C₂H₄) or ethane (C₂H₆).
Step-by-step explanation:
When acetylene (C₂H₂) reacts with hydrogen (H₂), it can form either ethylene (C₂H₄) or ethane (C₂H₆). The reactions can be represented as follows:
C₂H₂ + H₂ → C₂H₄
C₂H₂ + 2H₂ → C₂H₆
The formation of ethylene is an example of breaking a C-C double bond and forming two C-H bonds, while the formation of ethane involves breaking a C-C triple bond and forming four C-H bonds.