Question

Circle represent most acidic hydrogens in these molecules. Which of the following is correct representation?

• A.
• B.
• C.
• D. All of these

Answer 1

The correct option is D All of these

In compound (a), the circled $OH$ is more acidic because the adjacent carbon has three fluorine atom which shows strong -I effect. This withdraws the electron density and make the ease of release of $H^{+}$. Thus, it is a correct representation.

In compound (b), carboxylic group is represented as strong acidic group. Carboxylic acid group are more acidic than $OH$ group due to the resonance stabilisation in carboxylate anion. It has 2- equivalent resonating structures. Thus, it is a correct representation.

In compound (c), the carbanion formed after the removal of circled hydrogen is more stable because it forms aromatic compound with $6\pi$ electrons. Thus, it is also a correct representation.