Let's break down the question and analyze the acidity: ## Step 1: Identify the Compounds androgens - **Compound A:** The highlighted hydrogen is attached to a carbon in a simple alkane chain. - **Compound B:** The highlighted hydrogen is attached to a carbon that is next to a carbonyl group (C=O); this is an **α-hydrogen** of a ketone. ## Step 2: Analyze Acidity - **Acidity** is determined by the stability of the conjugate base formed after deprotonation. - When the hydrogen is removed, the negative charge is left on the carbon atom. ### **Compound A:** - The conjugate base is a carbanion on a simple alkane (sp³ hybridized carbon). - No resonance stabilization; just a plain carbanion. ### **Compound B:** - The conjugate base is a carbanion on the α-carbon of a ketone (next to C=O). - The negative charge can be **delocalized via resonance** onto the oxygen of the carbonyl group, making it much more stable. #### Resonance structure for B: ``` O O⁻ || | C–C–C–H → C–C=C–H (negative charge on O) ``` ## Step 3: Compare Hybridization - In **A**, the carbon is sp³ hybridized. - In **B**, the carbon is still sp³, but the resonance with the carbonyl group is the key stabilizing factor. ## Step 4: Match with Provided Answers - **A is the stronger acid because its conjugate base is stabilized by resonance.** (Incorrect; A does not have resonance stabilization.) - **A is the stronger acid because the carbon atom bearing the highlighted proton is sp² hybridized.** (Incorrect; in A, the carbon is sp³ hybridized.) - **B is the stronger acid because its conjugate base is stabilized by resonance.** (**Correct**; this is the main reason.) - **B is the stronger acid because the carbon atom bearing the highlighted proton is sp² hybridized.** (Incorrect; the carbon is not sp² hybridized.) ## **Final Answer** ### **B is the stronger acid because its conjugate base is stabilized by resonance.** **Explanation:** The conjugate base formed when the hydrogen is removed from compound B is stabilized by resonance with the adjacent carbonyl group, making it much more acidic than compound A. --- **Final Answer:** **B is the stronger acid because its conjugate base is stabilized by resonance.**