KCET · Chemistry · General Organic Chemistry

IUPAC name of the compound

A \( 1 \)-Bromo but-2-ene
B Bromo butene
C 2-Bromo-2-butene
D 1-Bromo but-3-ene

Verified Solution

Answer & Solution

Correct Answer

(A) \( 1 \)-Bromo but-2-ene

Step-by-step Solution

Detailed explanation

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.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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