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Question:

Ethane, with the molecular formula C₂H₆, has: 6 covalent bonds, 7 covalent bonds, 9 covalent bonds, or 8 covalent bonds?

7covalent bonds

8covalent bonds

6covalent bonds

9covalent bonds

Solution:

The correct option is B: 7 covalent bonds
Ethane with molecular formula C₂H₆ has seven covalent bonds. 6 bonds between C−H and one is between C−C. The six hydrogen atoms will each share their 1 electron with carbon to form six carbon-hydrogen covalent bonds. The two carbon atoms will each share their 1 electron to form one carbon-carbon covalent bond.