Question

which of the following best describes a possible carbon compound? one carbon atom forms a quadruple bond with another carbon atom. one carbon atom forms a double bond with an oxygen atom and two single bonds with two hydrogen atoms. one carbon atom forms five single bonds with five hydrogen atoms. one carbon atom forms a triple bond with another carbon atom and a double bond with an oxygen atom.

Explanation:

To determine a possible carbon compound, we analyze carbon's valence (4 valence electrons, so it forms 4 bonds total, considering single, double, triple bonds: single = 1 bond, double = 2, triple = 3).

• First option: Quadruple bond between two C atoms. Each C would have 4 bonds (quadruple), but carbon's atomic structure (small size, electron repulsion) makes quadruple bonds between C atoms extremely rare/impossible in stable compounds.
• Second option: One C forms a double bond (2 bonds) with another C, and needs 2 more bonds (since 4 total). Wait, no—wait, the option says "one carbon atom forms a double bond with an oxygen atom and two single bonds with two hydrogen atoms"? Wait, no, re-reading: Wait, the second option (after the first) is "One carbon atom forms a double bond with an oxygen atom and two single bonds with two hydrogen atoms"? Wait, no, let's list each:

1. "One carbon atom forms a quadruple bond with another carbon atom." → C has 4 valence electrons. A quadruple bond would mean each C uses 4 electrons to bond, but carbon’s orbitals (sp, sp², sp³) and electron repulsion make this unstable/impossible in typical compounds.
2. "One carbon atom forms a double bond with an oxygen atom and two single bonds with two hydrogen atoms." → Double bond (2 bonds) with O, two single bonds (1 each) with H. Total bonds: 2 + 1 + 1 = 4. This matches carbon’s valence (4 bonds). Let's check others:
3. "One carbon atom forms five single bonds with five hydrogen atoms." → Carbon can only form 4 bonds (valence 4), so 5 bonds is impossible.
4. "One carbon atom forms a triple bond with another carbon atom and a double bond with an oxygen atom." → Triple bond (3 bonds) with C, double bond (2 bonds) with O. Total: 3 + 2 = 5, which exceeds carbon’s 4-bond limit.

So the second option (One carbon atom forms a double bond with an oxygen atom and two single bonds with two hydrogen atoms) is valid because it sums to 4 bonds (double = 2, two singles = 2; 2 + 2 = 4), matching carbon’s valence.

Answer:

One carbon atom forms a double bond with an oxygen atom and two single bonds with two hydrogen atoms