Question

Which of the following has highly acidic hydrogen?

• A.
• B.
• C.
• D.

Answer 1

The Correct Option is D

To identify the compound with a highly acidic hydrogen, analyze the structures presented. An acidic hydrogen is readily removed as a proton (H⁺). Such hydrogens are typically found in functional groups like carboxylic acids, phenols, and enols.

Common sources of acidic hydrogens include:

• Carboxylic acids
• Phenols
• Aldehydes and ketones with enolizable hydrogens

Given that the options are images and one is marked correct, let's examine why it might have a highly acidic hydrogen, using typical examples:

1. Carboxylic Acids: The hydrogen on the -COOH group is highly acidic.
2. Phenols: The hydrogen on an -OH group directly bonded to an aromatic ring is moderately acidic.
3. Enols: The hydrogen in the enol form of keto-enol tautomerism can be acidic.

The provided correct answer image:

This image depicts a structure likely containing a group such as a carboxylic acid or another functional group with an acidic hydrogen. The selection of this image as correct confirms the presence of such a group.

In summary, the selected image indicates a compound or group possessing significantly acidic hydrogen. This aligns with the principle that only specific functional groups exhibit high acidity.