MCQ
Which of the following is the correct $\text{IUPAC}$ name?
- ✓$3-$ Ethyl $-4, 4-$ dimethylheptane.
- B$4, 4-$ Dimethyl $-3-$ ethylheptane.
- C$5-$ Ethyl $-4, 4-$ dimethylheptane.
- D$4, 4-$ Bis $($methyl$)-3-$ ethylheptane.
✓
Answer
Correct option: A.
$3-$ Ethyl $-4, 4-$ dimethylheptane.
While writing $\text{IUPAC}$ name, the alkyl groups are written in alphabetical order. Thus lower locant $3$ is assigned to ethyl. Prefix, di, tri, and tetra are not included in alphabetical order.
The structure is $\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{CH}_3\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ |\\\text{CH}_3-\text{CH}_2-\text{CH}_2-\text{C}-\text{CH}-\text{CH}_2-\text{CH_3}\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ |\ \ \ \ \ \ \ |\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{CH}\ \ \text{C}_2\text{H}_5$
The structure is $\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{CH}_3\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ |\\\text{CH}_3-\text{CH}_2-\text{CH}_2-\text{C}-\text{CH}-\text{CH}_2-\text{CH_3}\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ |\ \ \ \ \ \ \ |\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{CH}\ \ \text{C}_2\text{H}_5$
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