Question

which statement about organic compounds is true?
a compound found within a living organism is considered to be organic.
a naturally-occurring compound is organic, whereas a synthetic compound is inorganic.
a compound that contains oxygen and hydrogen is organic if the compound lacks carbon.
an organic compound typically has at least one carbon–hydrogen or carbon–carbon bond.

Explanation:

• Option 1: Some inorganic compounds (like water) are in living organisms, so this is wrong.
• Option 2: Synthetic compounds (e.g., synthetic ethanol) can be organic, so this is wrong.
• Option 3: Organic compounds must contain carbon, so a compound without carbon can't be organic. This is wrong.
• Option 4: Organic compounds are based on carbon, and typically have C - H or C - C bonds (e.g., methane, ethane). This matches the definition.

Answer:

D. An organic compound typically has at least one carbon–hydrogen or carbon–carbon bond.