. A saturated hydrocarbons always has       *A. a ring.B. only single bonds.C. at least one double or triple bond.D. more carbon atoms than hydrogen atoms

Break Down the Problem

1. Identify the characteristics of saturated hydrocarbons.
2. Analyze each provided option in relation to the definition of saturated hydrocarbons.

Relevant Concepts

• A saturated hydrocarbon is a type of hydrocarbon in which all bonds between carbon atoms are single bonds. This means that each carbon atom is saturated with hydrogen atoms, maximizing the number of hydrogen atoms.

Analysis and Detail

1. Option A: A ring.

   • Saturated hydrocarbons can form ring structures (cycloalkanes), but this is not a defining feature. Rings can also be found in unsaturated hydrocarbons.

2. Option B: Only single bonds.

   • This statement is correct; saturated hydrocarbons contain only single bonds between carbon atoms.

3. Option C: At least one double or triple bond.

   • This is incorrect as it describes unsaturated hydrocarbons, which contain either double or triple bonds.

4. Option D: More carbon atoms than hydrogen atoms.

   • This is incorrect as well. In saturated hydrocarbons, the number of hydrogen atoms is always greater than or equal to the number of carbon atoms, specifically following the formula $C_nH_{2n+2}$.

Verify and Summarize

• The correct option is determined based on the essential definition of saturated hydrocarbons.
• Analyzing each option confirms that the defining characteristic of saturated hydrocarbons is that they only have single bonds between carbon atoms.

Final Answer

B. only single bonds.