Let's solve the row as an (A to) in ** steps** with. --- ## Row 1: A → B ### **Step 1: Claisen Condensation (A)** - **Reaction:** Diethyl malonate + propanal in NaOEt/EtOH. - **Explanation:** NaOEt deprotonates one of the α-hydrogens on diethyl malonate, forming an enolate. The enolate attacks the carbonyl carbon of propanal, resulting in a β-keto ester after elimination of ethanol. ### **Step 2: Acid Hydrolysis and Decarboxylation (B)** - **Reaction:** β-keto ester + H₃O⁺, Δ (heating). - **Explanation:** The ester is hydrolyzed to a β-keto acid, which then undergoes decarboxylation (loss of CO₂) upon heating, forming a substituted ketone. --- ## **Final Answer (Row 1):** The product after both steps is a **substituted ketone** (after decarboxylation of the β-keto acid). --- If you need **all rows solved** in this format, let me know!

# Complete Solution for All Rows ## **Row 1: A → B** ### **Step 1: Claisen Condensation (A)** - **Reaction:** Diethyl malonate + propanal in NaOEt/EtOH. - **Explanation:** NaOEt deprotonates one of the α-hydrogens on diethyl malonate, forming an enolate. This enolate attacks the carbonyl carbon of propanal, resulting in a β-keto ester after the elimination of ethanol. ### **Step 2: Acid Hydrolysis and Decarboxylation (B)** - **Reaction:** β-keto ester + H₃O⁺, Δ (heating). - **Explanation:** The β-keto ester undergoes hydrolysis to form a β-keto acid. Upon heating, this acid decarboxylates (loses CO₂), yielding a substituted ketone. --- ## **Final Answer (Row 1):** The product after both steps is a **substituted ketone**. --- ## **Row 2: B → C** ### **Step 1: Nucleophilic Addition (B)** - **Reaction:** Substituted ketone + Grignard reagent (R-MgBr). - **Explanation:** The Grignard reagent acts as a nucleophile, attacking the carbonyl carbon of the substituted ketone. This leads to the formation of a tertiary alcohol after protonation. ### **Step 2: Acid Workup (C)** - **Reaction:** Tertiary alcohol + H₃O⁺. - **Explanation:** The alcohol is protonated and can undergo dehydration to form an alkene if conditions favor elimination. --- ## **Final Answer (Row 2):** The product is an **alkene** after dehydration of the tertiary alcohol. --- ## **Row 3: C → D** ### **Step 1: Hydrogenation (C)** - **Reaction:** Alkene + H₂ in the presence of a catalyst (e.g., Pd/C). - **Explanation:** The alkene undergoes hydrogenation, where H₂ adds across the double bond, converting the alkene into a saturated alkane. ### **Step 2: Purification (D)** - **Reaction:** Alkane purification (e.g., distillation). - **Explanation:** The final product is purified to remove any unreacted starting materials and catalyst residues. --- ## **Final Answer (Row 3):** The product is a **saturated alkane** after hydrogenation and purification. --- If you need further clarification on any row or additional details, feel free to ask!