$C H_{3} - C H_{2} - C | C H_{3} = C H - C H_{2} - C H_{3} | C H - C H_{2} - C H_{3}$

What is the IUPAC name of the following compound?

3,6-Dimethyl-3-octene

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3,6-Dimethyl-3-octene

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2-Ethyl-5-methyl-2-heptene

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None of the above

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Solution

The correct option is A
3,6-Dimethyl-3-octene

If you can get the parent chain right, you will get the answer.

Parent chain is
$1 C H_{3} - 2 C H_{2} - 3 C | C H_{3} = 4 C H - 5 C H_{2} - C H_{3} 6 | C H - 7 C H_{2} - 8 C H_{3}$

Word root $\Rightarrow$ but

Double bond $\Rightarrow$ suffix $\Rightarrow$ ene

Two methyl groups at $C_{3}$ and $C_{5} \Rightarrow$ 3,6-dimethyl

Therefore, 3,6-Dimethyl-3-octene

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