Number of carbon atoms in the longest chain is 3. A methyl group is present at carbon number 2. So, IUPAC name is___________.

2-ethyl propane

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butane

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2-methyl propane

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2-methyl butane

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Solution

The correct option is A 2-methyl propane
Number of carbon atoms in the longest chain is 3, word root will be "prop" .
Methyl group is present at carbon number 2 of the parent chain. So, IUPAC name is 2-methyl propane.

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