Acetylene (C2H2) has a triple bond between the two carbons. So 3 pairs of electrons. Biomed is talking about ethylene (C2H4).
Explanation:
Acetylene (systematic name: ethyne) is the synthetic compound with the formula C2H2. It is a hydrocarbon and the simplest alkyne. This colorless gas is widely utilized as a fuel and a chemical structure block. It is uncertain in its pure form and thus is usually marketed as a solution