How many covalent bonds are present in a molecule of ethane (C2H6)?
Correct: B
Ethane (C2H6) has the structure CH3-CH3. Each carbon atom forms 3 covalent bonds with hydrogen atoms and 1 covalent bond with the other carbon atom. So, there are 3 C-H bonds on the first carbon, 3 C-H bonds on the second carbon, and 1 C-C bond between the two carbons. Total covalent bonds = 6 (C-H) + 1 (C-C) = 7 covalent bonds.