Which nomenclature is not according to IUPAC system?

$B r - C H_{2} - C H = C H_{2} 1 - b r o m o p r o p - 2 - e n e$

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Solution

The correct option is A
$B r - C H_{2} - C H = C H_{2} 1 - b r o m o p r o p - 2 - e n e$

In IUPAC system of nomenclature, preference is given to multiple bond than halogen substituent, so the correct name of

$321 B r - C H_{2} - C H = C H_{2} 1 - b r o m o p r o p - 2 - e n e$

Priority is given to double bond than halogen.

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