Aldehydes and Ketones are known as ______.

• A. Reactive groups
• B. Reactive chemicals
• C. Incompatible groups
• D. Non-reactive groups

Answer: (A)

The main idea here is recognizing aldehydes and ketones by their reactive carbonyl functional group. The carbonyl group (C=O) is highly polar: the carbon carries partial positive charge and the oxygen carries partial negative charge, making the carbonyl carbon an attractive target for many reagents. This polarization drives a wide range of reactions—nucleophilic additions, reductions, oxidations, and acetal/ hydrate formation—so these groups behave as highly reactive sites within molecules. That’s why aldehydes and ketones are described as reactive groups. Other labels like reactive chemicals focus more on the hazard of an entire substance, not on the functional blueprint that governs its chemistry, while incompatible groups refer to specific dangerous pairings and non-reactive groups contradicts the observed reactivity of carbonyls.