a
In \(IUPAC\) system of nomenclature, preference is given to multiple bond than halogen substituent, so the correct name of Double bond more priore than halogen
\(\mathop {Br - {{\mathop {CH}\limits^3 }_2} - \mathop {CH}\limits^2 = {{\mathop {CH}\limits^1 }_2}}\limits_{3\, - \,bromoprop\, - \,1\, - \,ene} \) is