Determine the number of carbon atoms that are involved in the planar double-bond system in the given structure.

Are the following amines correctly labeled as 4° ammonium ion, 3° amine, 2° amine, and 1° amine?

Gambierol is a toxin from marine algal bloom that is responsible for fish poisoning. A group of scientists from Tohoku University, Japan has reported its isolation and structure determination in 1993. The structure was found to have a large number of fused rings.

(a) Determine the number of ether groups present?
(b) Determine the number of alcohol groups present, and classify each of them as 1°, 2°, or 3°.
(c) Identify if there are any other functional groups.

Classify the following carbocation as primary (1°), secondary (2°), tertiary (3°), or quaternary (4°), based on the carbon atom with the positive charge.

What functional groups are possible in a molecule with the molecular formula C₅H₁₀O?

Draw a Lewis structure of the given compounds. Based on their functional group, classify each as an alkene, ketone, aldehyde, carboxylic acid, ether, or alcohol.