Question

question 3
which of the following is not an organic compound?
a carbohydrates
b water
c lipids
question 4
which element is the main element found in organic compounds, thus essential to all known life on earth?
a carbon
b oxygen
c water

Explanation:

For Question 3: Organic compounds contain carbon. Carbohydrates (e.g., glucose \(C_6H_{12}O_6\)) and lipids (e.g., triglycerides with carbon - based structures) are organic. Water (\(H_2O\)) has no carbon, so it is not organic.
For Question 4: By definition, organic compounds are mainly based on carbon. Oxygen is part of many compounds (organic and inorganic), and water is a compound (not an element).

Answer:

Question 3: B. water
Question 4: A. carbon