Answer:
B. 8
Step-by-step explanation:
Ethene, also known as ethylene, is an unsaturated hydrocarbon with the chemical formula C2H4. The molecule contains a double bond between the two carbon atoms, which is formed by sharing of two pairs of electrons. Each carbon atom is also bonded to two hydrogen atoms through single covalent bonds. Therefore, the total number of shared pairs of electrons in ethene is 4 (for the double bond) + 4 (for the four single bonds between carbon and hydrogen atoms) = 8.