Which of the following is an allylic cation? I. CH;CH=CH, IV. CH;ČHCH CH=CH, I. CH;CH=CH-ČH, V. O III. CH;CHCH3

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Please explain which is the allylic cation
### Identifying Allylic Cations

**Question:**  
Which of the following is an allylic cation?

**Options:**  
I. \( \text{CH}_3\overset{+}{\text{C}}\text{H-CH}_2 \)

II. \( \text{CH}_3\text{CH}=\overset{+}{\text{C}}-\text{CH}_2 \)

III. \( \text{CH}_3\overset{+}{\text{C}}\text{HCH}_3 \)

IV. \( \text{CH}_3\text{CHCH}=\overset{+}{\text{C}}\text{H-CH}_2 \)

V. Cyclohexane with a \( \overset{+}{\text{C}} \) ion

**Select one:**  
- a. I  
- b. II  
- c. III  
- d. IV  
- e. V  

**Explanation:**

An allylic cation is a positively charged ion (cation) located at the carbon atom adjacent to a carbon-carbon double bond (allylic position). In the options provided, structure **II** is an allylic cation because the positive charge is located on a carbon that is adjacent to a double bond, which is characteristic of an allylic cation.
Transcribed Image Text:### Identifying Allylic Cations **Question:** Which of the following is an allylic cation? **Options:** I. \( \text{CH}_3\overset{+}{\text{C}}\text{H-CH}_2 \) II. \( \text{CH}_3\text{CH}=\overset{+}{\text{C}}-\text{CH}_2 \) III. \( \text{CH}_3\overset{+}{\text{C}}\text{HCH}_3 \) IV. \( \text{CH}_3\text{CHCH}=\overset{+}{\text{C}}\text{H-CH}_2 \) V. Cyclohexane with a \( \overset{+}{\text{C}} \) ion **Select one:** - a. I - b. II - c. III - d. IV - e. V **Explanation:** An allylic cation is a positively charged ion (cation) located at the carbon atom adjacent to a carbon-carbon double bond (allylic position). In the options provided, structure **II** is an allylic cation because the positive charge is located on a carbon that is adjacent to a double bond, which is characteristic of an allylic cation.
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