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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 $IUPAC$ name of the compound having the formula is

$\begin{matrix}
   C{{H}_{3}}\,\,\,\,\,\,\,  \\
   |\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,  \\
   {{H}_{3}}C-C-CH=C{{H}_{2}}  \\
   |\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,  \\
   C{{H}_{3}}\,\,\,\,\,\,\,\,\,  \\
\end{matrix}$

  • A
    $3, 3, 3-$ Trimethylprop $-1-$ ene
  • B
    $1, 1, 1-$ Trimethylprop $-2-$ ene
  • ✓
    $3, 3-$ Dimethylbut $-1-$ ene
  • D
    $2, 2-$ Dimethylbut $-3-$ ene
✓

Answer

Correct option: C.
$3, 3-$ Dimethylbut $-1-$ ene
c
The IUPAC name of $\left( CH _3\right)_3 CCH = CH _2$ is $3,3$- Dimethyl -$1$ - butene as the longest parent chain has four carbon atoms with a $C _1= C _2$ (lowest numbering to double bond) and two methyl substituents at $C _3$.

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