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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
$IUPAC $ name of the following compound will be

$\begin{array}{*{20}{c}}
  {C{H_3} - CH = C - C{H_2} - C{H_3}} \\ 
  {|\,\,} \\ 
  {\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,C{H_2} - C{H_2} - C{H_3}} 
\end{array}$

  • ✓
    $3-$ ethyl $-2-$ hexene
  • B
    $3-$ propyl $-2-$ hexene
  • C
    $3-$ propyl $-3-$ hexene
  • D
    $4-$ ethyl $-4-$ hexene
✓

Answer

Correct option: A.
$3-$ ethyl $-2-$ hexene
a
According to IUPAC:

Longest carbon chain consists of $6$ carbons. Hence, it is hexene.

Closet double bond from starting is from second carbon. hence it is hex-$2$-ene.

Now, ethyl group $C _2 H _5$ is attached at the third carbon from starting.

Hence it is $3$-ethyl-$2$-hexene.

Hence, IUPAC name is $3$-ethyl-$2$-hexene.

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