Which is the IUPAC name of the compound $C H_{3} - C H_{2} - C H = C H - C H_{3}$ ?

(a) Pent-3-ene
(b) Pent-2-ene

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Solution

The given molecular formula is $C H_{3} - C H_{2} - C H = C H - C H_{3}$ .

It is composed of five carbon atoms with a double bond.

So, the parent chain name is 'Pent' and the suffix for an alkene is used as 'ene'.

The numbering is done in such a way that a smaller number is assigned to carbon atoms lined to double bond.

Therefore, the IUPAC name is Pent-2-ene.

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