Let's break down the problem **step-by-step**: --- ## **Step 1: Identify the Alcohol** The structure shown is: ``` H₂C | cyclobutane-CH₂CH₂OH ``` This is **2-(hydroxymethyl)cyclobutane**, or **cyclobutyl ethanol**. --- ## **Step 2: Grignard Synthesis of Alcohols** A Grignard reagent (RMgBr) reacts with an aldehyde or ketone to form a new alcohol. For a **primary alcohol** like this one, the general reaction is: ``` Aldehyde/Ketone + Grignard reagent → Alcohol ``` --- ## **Step 3: "Disconnect" the Alcohol** The alcohol group is attached to a two-carbon chain off the cyclobutane ring. Draw the structure: ``` Cyclobutane-CH₂-CH₂-OH ``` We want to "disconnect" this at the carbon attached to the OH (the alcohol carbon), considering that this carbon was originally attached to either: - An **aldehyde/ketone** - An **alkyl bromide** (for the Grignard) ### **Possible Disconnections:** #### **Option 1:** - **Aldehyde/Ketone:** Cyclobutanecarboxaldehyde (Cyclobutane-CH₂-CHO) - **Alkyl Bromide:** Ethyl bromide (CH₂Br) #### **Option 2:** - **Aldehyde/Ketone:** Acetaldehyde (CH₃CHO) - **Alkyl Bromide:** Cyclobutylmethyl bromide (Cyclobutane-CH₂-Br) --- ## **Step 4: Draw the Structures** ### **Aldehyde/Ketone and Alkyl Bromide Pairs** #### **Pair 1:** - **Aldehyde:** Cyclobutanecarboxaldehyde Structure:  (Cyclobutane ring with a CH₂CHO group attached) - **Alkyl bromide:** Methyl bromide (bromomethane) Structure: CH₂Br #### **Pair 2:** - **Aldehyde:** Acetaldehyde (ethanal) Structure: CH₃CHO - **Alkyl bromide:** Cyclobutylmethyl bromide Structure: Cyclobutane ring with a CH₂Br group --- ## **Step 5: Final Answer** ### **Aldehyde/Ketone:** - **cyclobutanecarboxaldehyde** (cyclobutane-CH₂-CHO) - **acetaldehyde** (CH₃CHO) ### **Alkyl Bromide:** - **bromomethane** (CH₂Br) - **cyclobutylmethyl bromide** (cyclobutane-CH₂-Br) --- ## **Summary Table** | Aldehyde/Ketone | Alkyl Bromide | |-------------------------------|----------------------------| | cyclobutanecarboxaldehyde | bromomethane (CH₂Br) | | acetaldehyde (CH₃CHO) | cyclobutylmethyl bromide | --- **These are the structural formulas for an aldehyde or ketone and alkyl (or aryl) bromide that could be used in a Grignard synthesis of the alcohol shown.**