Q16 / 180 · KCET 2016 · Chemistry
IUPAC name of the compound
- Correct answerA\( 1 \)-Bromo but-2-ene
- BBromo butene
- C2-Bromo-2-butene
- D1-Bromo but-3-ene
Solution
The IUPAC name of the given compounds, \( \mathrm{CH}_{3}-\mathrm{CH}=\stackrel{3}{\mathrm{CH}}-\mathrm{CH}_{2}^{2}-\mathrm{Br} \) is \( 1 \)-bromobut-2-ene. If the numbering of
the carbon atoms starts from bromide attached carbon, that is \( \mathrm{CH}_{3}-\stackrel{2}{\mathrm{CH}}=\stackrel{3}{\mathrm{CH}}-\stackrel{4}{\mathrm{CH}}_{2}-\mathrm{Br} \), the numbering will be
incorrect order of numbering because, functional groups are not getting least number.
the carbon atoms starts from bromide attached carbon, that is \( \mathrm{CH}_{3}-\stackrel{2}{\mathrm{CH}}=\stackrel{3}{\mathrm{CH}}-\stackrel{4}{\mathrm{CH}}_{2}-\mathrm{Br} \), the numbering will be
incorrect order of numbering because, functional groups are not getting least number.
Hence, the correct answer is option: 'A'.