Let's solve the resonance structures for each given cation, step by step. --- ## **Structure h** ### **Structure:** A carbocation with the positive charge on a secondary carbon, adjacent to a double bond (allylic carbocation). ### **Step 1: Draw the Structure** Let's label the carbon atoms for clarity: ``` CH2=CH-CH+-CH3 ``` - The positive charge is on the carbon next to the double bond. ### **Step 2: Resonance Arrow Pushing** Move electrons from the double bond towards the carbocation: - The double bond shifts so the positive charge moves: ``` CH2-CH=CH-CH3 + ``` Now, the positive charge is on the terminal carbon of the double bond. ### **Step 3: Resonance Structures** 1. **Original:**  2. **After Arrow Pushing:**  ### **Step 4: Most Contributing Structure** Both structures contribute, but generally, the more substituted carbocation is more stable. In this case, the positive charge on the secondary carbon is more stable than on the primary carbon. --- ## **Structure i** ### **Structure:** A cation with a positive charge on an sp2-hybridized carbon adjacent to a double bond. ### **Step 1: Draw the Structure** ``` CH2=CH-C+=CH2 ``` - The positive charge is on the central carbon. ### **Step 2: Resonance Arrow Pushing** Move electrons from the double bond towards the carbocation: - The double bond shifts, moving the positive charge: ``` CH2+-CH=CH-CH2 ``` But this makes a positive charge on a primary carbon, which is less stable. ### **Step 3: Resonance Structures** 1. **Original:**  2. **After Arrow Pushing:**  ### **Step 4: Most Contributing Structure** The original structure is more stable, as the positive charge is on a more substituted carbon. --- ## **Structure j** ### **Structure:** A five-membered ring with an oxygen and a carbocation at the 2-position. ### **Step 1: Draw the Structure** ``` O / \ | | \ / C+ ``` ### **Step 2: Resonance Arrow Pushing** Move a lone pair from oxygen to form a double bond with the carbocation: - Oxygen gets a positive charge after donating a lone pair. ``` O+ // \ | | \ / ``` ### **Step 3: Resonance Structures** 1. **Original:**  2. **After Arrow Pushing:**  ### **Step 4: Most Contributing Structure** The structure with positive charge on oxygen is less stable, so the original is more contributing. --- ## **Structure k** ### **Structure:** A benzene ring with a methyl group and a positive charge (benzylic carbocation). ### **Step 1: Draw the Structure** ``` + | / \ | | \ / | CH3 ``` ### **Step 2: Resonance Arrow Pushing** The positive charge can delocalize into the aromatic ring: - Move a pair of pi electrons from the ring towards the carbocation, moving the positive charge around the ring. ### **Step 3: Resonance Structures** There are three main resonance structures, with the positive charge at the ortho and para positions relative to the methyl group. ### **Step 4: Most Contributing Structure** All resonance forms contribute, but the most stable is often the one where the charge is most delocalized. --- # **Summary Table** | Structure | Resonance Structures | Most Contributing | |-----------|---------------------|-------------------| | h | 2 | Original (sec. cation) | | i | 2 | Original (central cation) | | j | 2 | Original (O not charged) | | k | 3+ | All equally (delocalized) | Let me know if you'd like these structures hand-drawn or further step-by-step resonance arrows for each one!

# Resonance Structures for Structure h ## **Step 1: Draw the Structure** We start with a secondary carbocation adjacent to a double bond. The structural formula can be represented as follows: ``` CH2=CH-CH+-CH3 ``` - The positive charge is located on the secondary carbon (C+) adjacent to the double bond. ## **Step 2: Draw in All Electrons** To clarify the bonding and electron distribution, we add all electrons, including lone pairs and hydrogen atoms: ``` H H H | | | C = C - C⁺ - C | | H H ``` ## **Step 3: Resonance Arrow Pushing** We can show the movement of electrons from the double bond towards the carbocation. This results in the following resonance structure: 1. Original Structure: ``` H H H | | | C = C - C⁺ - C | | H H ``` 2. After Arrow Pushing: ``` H H | | C - C = C - C | H ``` ## **Step 4: Resonance Structures** The resonance structures can be summarized as follows: 1. **Original Structure:** Positive charge on C+. 2. **Resonance Structure:** Positive charge shifts to the terminal carbon of the double bond. ### **Visual Representation of Structures** 1. **Original Structure:**  2. **After Arrow Pushing:**  ## **Step 5: Most Contributing Structure** - The original structure is often more stable since the positive charge is on a more substituted carbon (secondary carbocation). - The resonance structure with the positive charge on the end carbon is less stable due to it being a primary carbocation. ## **Conclusion** The most contributing resonance structure for the given carbocation is the original structure where the positive charge is on the secondary carbon adjacent to the double bond.