The IUPAC name of the compound is

3-Methylspiro[5,4]dec -2-ene

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2-Methylspiro[4,5]dec-1-ene

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3-Methylspiro[4,5]dec-2-ene

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2-Methyspiro[5,4]dec-1-ene

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Solution

The correct option is B
2-Methylspiro[4,5]dec-1-ene

The carbon atoms of the given compound are numbered as below:

Total number of carbon atoms =10 (word root = dec)

There is a double bond between $C_{1} a n d C_{2}$

Further, there is a methyl $(- C H_{3})$ substituent at $C_{2}$ .

Hence the IUPAC name is

(B) 2-Methylspiro[4,5]dec-1-ene

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The IUPAC name of the compound is

(i) Write the IUPAC name of the following compounds.
$C H_{3} - C H | C H_{3} - C H | O H - C H | C_{2} H_{5} - C H | O H - C H_{3}$

(ii) Write the IUPAC name of the following compound

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