Identify an aldehyde used in margarine and in food for its buttery odour.

Step-by-step solution

The correct answer is (2) Butyraldehyde. Butyraldehyde (also known as butanal) is an aldehyde that has a characteristic buttery odor. It is commonly used in the food industry to impart a buttery flavor, and it is also found in margarine to enhance its aroma. Here's a quick look at the other options: - (1) Benzaldehyde: This aldehyde has an almond-like aroma and is used in flavorings and perfumes, but not for a buttery odor. - (3) Cinnamaldehyde: This aldehyde is responsible for the characteristic flavor and aroma o