Which of the following I.U.P.A.C. name is correct ?

2-Methyl-3-ethyl pentane

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2 -ethyl - 3-Methyl pentane

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3-ethyl-2-methyl pentene

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3-Metyl-2-ethyl pentene

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Solution

The correct option is A 2-Methyl-3-ethyl pentane
Correct IUPAC name: 2- Methyl- 3 ethyl pentane.
As the longest carbon chain is 5 carbon, pentane.
It cannot be 2-ethyl, because then the longest carbon chain will become hexane.
Always the iupac name starts with the least number.

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