The name of ClCH2 - C = C - CH2Cl according to IUPAC nomenclature system is

Question

The name of \(ClCH_2 - \underset {\underset {Br}{|}}{C} = \underset {\underset {Br}{|}}{C} -CH_2Cl\) according to IUPAC nomenclature system is 

(a) 2, 3-Dibromo-1, 4-dichlorobutene-2 

(b) 1, 4-Dichloro-2, 3-dibromobutene-2

(c) Dichlorodibromobutene  

(d) Dichlorodibromobutane

Answer 1

Correct option is (a) 2, 3-Dibromo-1, 4-dichlorobutene-2 

Since b (from bromo) comes earlier in alphabetical order than c (from chloro), the correct name should be 2, 3- dibromo-1, 4-dichlorobutene-2 and not 1,4-dichloro-2, 3-dibromobutene-2.