Which one of the following IUPAC name is incorrect?

Pent - 3 - ene

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Ethanoic acid

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3-methyl pentan- 2-ol

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Ethanal

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Solution

The correct option is A
Pent - 3 - ene

The numbering of double bond is 2 from the other end of the chain. The numbering is done to give the lowest possible no. to the double bond.

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Hex-2-en-4-ynoic acid

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