Question

The structure for neo-heptyl alcohol is:

• A.

  

• B.

  

• C.

  

• D. \(n-C_7H_{15}OH\)

Hint:

“Neo” = \((CH_3)_3C-\) group (tert-butyl skeleton). Look for 3 methyl groups on one carbon.

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
The prefix "neo" in organic nomenclature refers to a structure where a quaternary carbon (a carbon atom bonded to four other carbon atoms) is present at the end of the chain, typically forming a "terminal" tert-butyl group.
Step 2: Detailed Explanation:
1. "Heptyl" indicates a total of 7 carbon atoms in the molecule.
2. "Neo" structure specifically implies that one end of the molecule is a \( (\text{CH}_{3})_{3}\text{C}- \) group (4 carbons).
3. To complete the 7 carbons, we need a 3-carbon chain attached to this group.
4. For it to be a primary "neo-alkyl" alcohol, the hydroxyl group (\( -\text{OH} \)) should be at the opposite end of the chain from the quaternary carbon.
5. Structure: \( (\text{CH}_{3})_{3}\text{C}-\text{CH}_{2}-\text{CH}_{2}-\text{CH}_{2}-\text{OH} \).
Total Carbons: \( 3 \text{ (methyls)} + 1 \text{ (quaternary)} + 3 \text{ (chain)} = 7 \text{ carbons} \).
Step 3: Final Answer:
The structure \( (\text{CH}_{3})_{3}\text{C-CH}_{2}\text{CH}_{2}\text{CH}_{2}\text{OH} \) represents neo-heptyl alcohol.