Question

select the correct answer. which of these elements is rarely found in organic molecules? a. hydrogen b. oxygen c. barium d. carbon

Explanation:

Organic molecules are primarily composed of carbon, hydrogen, and often oxygen (e.g., in carbohydrates, lipids, etc.). Barium is an alkaline earth metal and is not a typical component of organic molecules, as organic chemistry focuses on carbon - based compounds with elements like H, O, N, S, P usually. Hydrogen (A) is common (e.g., in hydrocarbons), oxygen (B) is common (e.g., in alcohols, carboxylic acids), and carbon (D) is the backbone of organic molecules. So barium is rarely found.

Answer:

C. barium