Verifying statements on ethane and ammonia structures

Steps:

• Statement 1: Ethane formula is C₂H₆ (not CH₄, likely a typo), with 6 H atoms; ammonia NH₃ has 3 H atoms, so ethane has twice as many.
• Statement 2: Nitrogen (atomic number 7) has 7 total electrons, with 5 valence electrons in its outer shell for unreacted atom.
• Statement 3: Ethane's C–C bond is covalent, formed by sharing two electrons between carbon atoms.
• All statements hold true, selecting option A.

Why A is correct:

• A includes all three valid statements based on molecular formulas and covalent bonding principles.

Why the others are wrong:

• B omits statement 3, which correctly describes covalent sharing.
• C omits statement 2, which accurately states nitrogen's valence electrons.
• D omits statement 1, which matches the hydrogen atom ratio in ethane (C₂H₆) and ammonia.

Final answer: A