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8.1. Organic chemistry Nomenclature of organic compounds — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry8.1. Organic chemistry Nomenclature of organic compounds1 Mark
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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