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

Rajasthan BoardEnglish MediumSTD 11 ScienceChemistry8.1. Organic chemistry Nomenclature of organic compounds1 Mark
MCQ
The $IUPAC$ name for the formula

$\begin{array}{*{20}{c}}
  {\,\,\,\,H} \\ 
  {\,\,\,\,|} \\ 
  {C{H_3} - C = C - COOH} \\ 
  {|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\ 
  {C{H_3}\,\,\,\,\,\,\,\,\,\,\,\,\,} 
\end{array}$

  • A
    $2-$ methyl $-2-$ butenoic acid
  • B
    $3-$ methyl $-3-$ butenoic acid
  • ✓
    $3- $ methyl $-2-$ butenoic acid
  • D
    $2-$ methyl $-3-$ butenoic acid
✓

Answer

Correct option: C.
$3- $ methyl $-2-$ butenoic acid
c
The numbering is done from the right-hand side as a carboxylic acid is present in the right-hand side. There is a double bond present at the $C -2$ position and methyl group at the $C -3$ position.

Thus, the IUPAC name is: $3$-methyl-$2$-butenoic acid.

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