Answer:
Part 1.
Structural formula of methane:
- The chemical formula of methane is CH4.
- Its structure contains 4 covalent bonds. Four atoms of hydrogen are making 4 covalent bonds with one carbon atom.
- One carbon atom has valency of 4 electrons.
- It gets stable by sharing 4 electrons with four hydrogen atoms having one valence electron each.
Part 2.
Structural formula of ethane:
The chemical formula of ethane is C2H6.
- Its structure contains 7 covalent bonds. Six atoms of hydrogen are making 6 covalent bonds with two carbon atoms.
- One carbon atom has valency of 4 electrons.
- There is one C-C covelent bond.
- One gets stable by sharing 3 electrons with 3 hydrogen atoms having one valence electron each.
- So net bonds with H are 6 and With each other is one.
