The name of Cl H_2 C - C _ | , , _ Br = C _ | , , _ Br - C H_2 Cl… - Vidyadip

MCQ

The name of $Cl{H_2}C - \mathop {\mathop C\limits_{|\,\,} }\limits_{Br} = \mathop {\mathop C\limits_{|\,\,} }\limits_{Br} - C{H_2}Cl$ according to $IUPAC$ nomenclature system is :

✓
$2,3$ dibromo$-1, 4-$dichlorobutene$-2$
B
$1, 4-$dichloro$-2, 3-$bromobutene$-2$
C
Dichlorodibromobutene
D
Dichlorodibromobutane

✓

Answer

Correct option: A.

$2,3$ dibromo$-1, 4-$dichlorobutene$-2$

a
IUPAC name of given compound is $2,3$-dibromo-$1,4$-dichlorobut-$2$-ene. The unsaturated hydrocarbon has a $C _2= C _3$, two bromine atoms at $C _2$ and $C _3$ and chlorine atoms are present as substituents at $C_1$ and $C_4$, and bromine gets proirity over chlorine in substuient naming.

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