Which nomenclature is not according to IUPAC convention?

B r - C H_{2} - C H = C H_{2} 1 - Bromo - prop - 2 - ene

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Solution

The correct option is A $B r - C H_{2} - C H = C H_{2} 1 - Bromo - prop - 2 - ene$
$\begin{matrix} B r & - & C H_{2} & - & C H & = & C H_{2} 3 & 2 & 1 \end{matrix}$
The correct name is 3 – Bromoprop –1 – ene.

Alkenes have more priority than alkanes and halo group are always considered to be substituents.

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