What is the correct IUPAC name of the organic compound with structure: two methyl groups on C1 of a double bond (C1=C2), with a hydrogen on C2, and a bromo-methyl group on C3?(The compound is: text CH _3text C(CH _3text )=CHCH(Br)CH _3, i.e., a five-carbon chain with a double bond and bromine substituent)

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EEJ MAIN Chemistry QUESTION #7504

Question 1

What is the correct IUPAC name of the organic compound with structure: two methyl groups on C1 of a double bond (C1=C2), with a hydrogen on C2, and a bromo-methyl group on C3?
(The compound is: $\text{CH}_3\text{C(CH}_3\text{)=CHCH(Br)CH}_3$, i.e., a five-carbon chain with a double bond and bromine substituent)

3-Bromo-1,2-dimethylbut-1-ene
3-Bromo-3-methyl-1,2-dimethylprop-1-ene
2-Bromo-3-methylpent-3-ene
4-Bromo-3-methylpent-2-ene✔️

Correct Answer Explanation

Identify the longest chain containing the double bond: 5 carbons (pent), with double bond at C2 (pent-2-ene).

Number from the end that gives the double bond the lower locant. A methyl group appears at C3 and Br at C4.

IUPAC name: 4-Bromo-3-methylpent-2-ene

This is a 5-carbon chain ($n = 5$: pent) with double bond at position 2 (C2=C3), methyl at C3, and Br at C4.

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