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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 of $\begin{array}{*{20}{c}}
  {C{H_3} - CH - CHO\,\,} \\ 
  {|\,\,\,\,\,\,\,\,} \\ 
  {\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,C{H_2} - C{H_3}} 
\end{array}$ is
  • A
    butan $2-$ aldehyde
  • ✓
    $2-$ methyl butanal
  • C
    $3-$ methyl isobutyraldehyde
  • D
    $3-$ methyl butanal
✓

Answer

Correct option: B.
$2-$ methyl butanal
b
$\rightarrow$ Longest Carbon chain: $4$ carbons.

$\because\, CHO$ has higher priority than - $CH _3$. hence, the $C$-atom of -$CHO$ group would be given preference over $C$-atom of -$CH _3$ group.

$\rightarrow$ Hence, the IUPAC name of the given compound is: $2$-methyl butanal.

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