Ketones show ________.

• (A) Metamerism
• (B) Position isomerism
• (C) Structural isomerism
• (D) Functional group isomerism

Ketones are a type of organic compound characterized by the presence of a carbonyl group (C=O) flanked by carbon atoms. When considering the types of isomerism that ketones can exhibit, the correct answer is:

Structural Isomerism

Ketones demonstrate structural isomerism because they can have the same molecular formula but different structural arrangements. This means that ketones can exist in various forms where the carbon skeleton or the position of the carbonyl group differs.

Types of Isomerism Explained

• Metamerism: Involves compounds with the same functional group but different carbon chains.
• Position Isomerism: Occurs when the position of a functional group changes within the same carbon skeleton.
• Functional Group Isomerism: Involves compounds that have the same molecular formula but different functional groups.

In summary, the answer to the question is (C) Structural isomerism, as ketones can have different structural forms while maintaining the same molecular formula.